GMAT Club World Cup 2022 (DAY 8): Modern optical telescopes can detect

A. Pronouns used are creating a lots of confusion in referring to the subject.
B. Correctly uses the pronoun and meaning is clear.
C. The use of thus is not correct.
D. Parallelism error in the portion joined by "and".
E. Same pronoun reference problem.

Hence answer choice (B) IMO

Modern optical telescopes can detect stars at great distances; however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them invisible to the telescopes.

With so many 'they' and 'their' used in the stimulus text, it clearly is a classical test for pronoun usage..

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them

From an independent clause perspective, all the usage of them, they and their incorrect;y refers to optical telescopes

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them

Same pronoun errors as in (A)

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus

awkward meaning..these telescopes are invisible to themselves!!

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them

Pronouns correctly refer to the black holes

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them

Same pronoun errors as in (A) and (B)

(D) is the correct answer

ANSWER B

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them ambiguous use of "them" - can refer to black holes as well as telescopes

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them CORRECT - "their" and "them" refers correctly the subject "black holes"

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus usage of "due to" is incorrect

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them usage of "due to" is incorrect

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them ambiguous use of "their" - can refer to black holes as well as telescopes

Modern optical telescopes can detect stars at great distances; however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them invisible to the telescopes.

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them
Them is ambiguous - If it is referring to light particles or black holes

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
Them is ambiguous - If it is referring to light particles or black holes

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus
Correct

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them
Them is ambiguous - If it is referring to light particles or black holes

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
Them is ambiguous - If it is referring to light particles or black holes

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them
--> they can refer to both telescopes and stars. No clear referent

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
--> Looks okay

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus
--> "and thus" should be followed by a verb before the phrase "invisible to the telescopes"

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them
--> "and making them" has no parallel reference. It is a follow-up clause hence should be ",making them"

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
--> they can refer to both telescopes and stars. No clear referent.

IMHO Option B

Modern optical telescopes can detect stars at great distances; however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them invisible to the telescopes.

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them - Incorrect. Pronoun issue!

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them - Seems legit !

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus - awkward construction.

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them awkward construction.


E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them Incorrect. Pronoun issue!


IMO Option B

Answer: A

Modern optical telescopes can detect stars at great distances; however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them invisible to the telescopes.

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them --> Correct. eliminating other options, this option seems to be more precise. Even though lots of pronouns are used, they seem to refer back correctly.

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them --> Incorrect. undetectable to seems to incorrect idiom. should be undetectable by.

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus --> Incorrect. 'and thus' seems to be another reason and parallel with 'because light particles....'

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them --> Incorrect. and is causing a problem to the meaning. This can be misinterpreted as "Telescopes cannot detect black holes because making them invisible to the telescopes." which doesn't make sense.

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them --> Incorrect. Not clear if them in 'making them' refers to black holes or light particles.

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them
Pronoun ambiguity (them should refer to black holes, not gravitational fields). ELIMINATE

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
Pronoun ambiguity (their gravitational fields should refer to black holes, not telescopes). ELIMINATE

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus
Making them/are is missing after thus, incomplete sentence. ELIMINATE

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them
And making them is awkward construction and also them here is referring to gravitational fields, not black holes as it should. ELIMINATE

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
No redundancy of using telescopes again (they is fine), their gravitational fields correctly referring to black holes, and even them is correctly referencing back. ANSWER

Answer - E

Imo E

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them
Comma making them refers to the light particles. It's not the light particles that make them invisible rather the gravitational field.

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
their can refer back to telescopes or black holes.
C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus
and thus invisible to the telescopes refers to the light particles. Black holes are invisible to telescopes.
D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them
Same as A.
E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them
Correct. It's the gravitation field that's making them invisible.

ANSWER A for me

Modern optical telescopes can detect stars at great distances; however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them invisible to the telescopes.

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them
CORRECT because it’s the less confusing proposition, correct use of however too I guess
B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them => INCORRECT confusing use of their/them, they refer to telescope or to black holes ?

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus
=> INCORRECT wrong use of due to, cannot replace because of
D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them => INCORRECT wrong use of due to, cannot replace because of + and making them weird/not parallel

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them, I hesitated between this one and A, and I finally picked A because it seems to me that use of however was better there.

Modern optical telescopes can detect stars at great distances; however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them invisible to the telescopes.

A. however, they cannot detect black holes, because light particles are unable to escape from them because of their strong gravitational fields, making them

B. black holes, however, are undetectable to these telescopes, because their gravitational fields are so strong that light particles are unable to escape from them, making them

C. however, these telescopes cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and thus

D. these telescopes, however, cannot detect black holes, because light particles are unable to escape from them due to their strong gravitational fields and making them

E. they, however, cannot detect black holes, because their gravitational fields are so strong that light particles are unable to escape from them, making them

The correct answer is A.

Official Explanation is pinned as BEST Reply HERE.