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Physicists in England have discovered that quasars are the most 10 May 2020, 10:30
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B
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Question Stats:

81% (01:16) correct 19% (01:26) wrong based on 103 sessions

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Physicists in England have discovered that quasars are the most distant and luminous objects in the observed universe, appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.

A. quasars are the most distant and luminous objects in the observed universe, appear
B. quasars, the most distant and luminous objects in the observed universe, appear
C. quasars, the most distant and luminous objects in the observed universe and which appear
D. the most distant and luminous objects in the observed universe, quasars appear
E. the most distant and luminous objects in the observed universe, quasars, which appear

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B
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Physicists in England have discovered that quasars are the most 11 May 2020, 08:12
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Physicists in England have discovered that quasars are the most distant and luminous objects in the observed universe, appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.

A. quasars are the most distant and luminous objects in the observed universe, appear
B. quasars, the most distant and luminous objects in the observed universe, appear
C. quasars, the most distant and luminous objects in the observed universe and which appear
D. the most distant and luminous objects in the observed universe, quasars appear
E. the most distant and luminous objects in the observed universe, quasars, which appear

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IMHO (B)

Option (B) states the only essential parts - Excluding the middle non essential modifier

Physicists in England have discovered that quasars, the most distant and luminous objects in the observed universe, appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.
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Physicists in England have discovered that quasars are the most 11 May 2020, 08:27
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A- Verb "Appear" does not have a subject
B- Correct
C- "Quasars" does not have a verb
D- Modifier "the most distant and luminous objects in the observed universe" is incorrectly placed before the subject "Quasars". Also relative pronoun "That" should be followed by a subject
E- Same as D and Subject "Quasars" does not have a verb

IMO B.
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Physicists in England have discovered that quasars are the most 12 May 2020, 09:53
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Physicists in England have discovered that quasars are the most distant and luminous objects in the observed universe, appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.

A. quasars are the most distant and luminous objects in the observed universe, appear
B. quasars, the most distant and luminous objects in the observed universe, appear
C. quasars, the most distant and luminous objects in the observed universe and which appear
D. the most distant and luminous objects in the observed universe, quasars appear
E. the most distant and luminous objects in the observed universe, quasars, which appear

A. Physicists in England have discovered that quasars are the most distant and luminous objects in the observed universe, appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.
It seems the universe appear to emit light. However, it should be the definition of quasars. Incorrect.

B. Physicists in England have discovered that quasars, the most distant and luminous objects in the observed universe, appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.
Quasars appear to emit light. Correct

C. Physicists in England have discovered that quasars, the most distant and luminous objects in the observed universe and which appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.
Quasars an effect likely caused by gravitational distortion. Meaning change. Incorrect

D. Physicists in England have discovered that the most distant and luminous objects in the observed universe, quasars appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.
... and luminous objects in the observed universe an effect likely caused .. meaning change. Incorrect

E. Physicists in England have discovered that the most distant and luminous objects in the observed universe, quasars, which appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.
Quasars an effect likely caused by gravitational distortion. Meaning change. Incorrect
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Physicists in England have discovered that quasars are the most 12 May 2020, 13:53
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Physicists in England have discovered that quasars are the most distant and luminous objects in the observed universe, appear to emit light at the same rate regardless of their distance from Earth, an effect likely caused by gravitational distortion due to black holes.

A. quasars are the most distant and luminous objects in the observed universe, appear -- This is a run-on sentence with two main verbs in the same sentence
B. quasars, the most distant and luminous objects in the observed universe, appear -- clear meaning, main subject Quasars, followed by appositive describing them (the most distant and luminous objects in the observed universe)
C. quasars, the most distant and luminous objects in the observed universe and which appear -- This doesn't have a working IC
D. the most distant and luminous objects in the observed universe, quasars appear -- subtle change in meaning, the main subject is no more Quasars, rather it is luminous objects. Hence B is a better choice
E. the most distant and luminous objects in the observed universe, quasars, which appear -- same error as C


Answer: B
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