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Choice is E option.

1)There are 2 things X and Y, so plural verb is required- Contribute , not contributes

Eliminate C and D

2) Parallelism between X and Y, only E is fulfilling this condition.
Eliminate A and B

A) dresses and his performance in athletics contribute to his degree of popularity

B) is dressing and will perform in athletics contribute to his degree of popularity

C) dresses and his performance in athletics contributes to his degree of popularity

D) dresses contributes to his degree of popularity, along with his performance in athletics

E) dresses and how he performs in athletics contribute to his degree of popularity- CORRECT
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option e

parallelism error

how he dresses and he performs

moreover contribute is correct for plural noun
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A)behaviorists determined that how a teenage boy dresses and his performance in athletics contribute to his degree of popularity -> Parallelism issue

B)behaviorists determined that how a teenage boy is dressing and will perform in athletics contribute to his degree of popularity -> Parallelism issue

C)behaviorists determined that how a teenage boy dresses and his performance in athletics contributes to his degree of popularity ->Parallelism issue + Subject verb agreement issue

D)behaviorists determined that how a teenage boy dresses contributes to his degree of popularity, along with his performance in athletics -> Makes it seem that how a teenage boy dresses contributes to his performance in athletics.

E)behaviorists determined that how a teenage boy dresses and how he performs in athletics contribute to his degree of popularity ->Correct
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Simple parallelism question. Answer is E


generis

Project SC Butler: Sentence Correction (SC2)


For SC butler Questions Click Here



Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy dresses and his performance in athletics contribute to his degree of popularity.

A) dresses and his performance in athletics contribute to his degree of popularity : How he dresses has to be parallel with his performance. One is verb and the other is noun

B) is dressing and will perform in athletics contribute to his degree of popularity: How he is dressing and will perform are not parallel

C) dresses and his performance in athletics contributes to his degree of popularity Same error as A. Plus introduces new error "contributes" by treating singular

D) dresses contributes to his degree of popularity, along with his performance in athletics. Changes the meaning of the sentence. According to this, dressing sense contributes to both popularity and performance

E) dresses and how he performs in athletics contribute to his degree of popularity Correct
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Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy dresses and his performance in athletics contribute to his degree of popularity.

A) dresses and his performance in athletics contribute to his degree of popularity

B) is dressing and will perform in athletics contribute to his degree of popularity

C) dresses and his performance in athletics contributes to his degree of popularity

D) dresses contributes to his degree of popularity, along with his performance in athletics

E) dresses and how he performs in athletics contribute to his degree of popularity

generis :- "Based on study" is modifying "behaviorists" which imo is incorrect even though it is not a part of underlined.

Though I would go with E for this one. 2 items "how he dresses" and "how he performs" contribute to Y.
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OFFICIAL EXPLANATION

Project SC Butler: Sentence Correction (SC2)


• HIGHLIGHTS

AND
Whenever you see the word and, check quickly to see whether parallelism is involved.
And is the most common marker of parallelism.

HOW can be a conjunction
-- how means in what way and as a conjunction, can join two independent clauses
-- I fixed your martini how you like it.

HOW can also anchor something called a noun clause (nominal clause,substantive clause)
-- Where they live is two hours' drive from here.
-- Whoever blames everyone else is probably the perpetrator.
-- Whenever he starts spouting his disturbing ideas, I holler at the television.
The italicized clauses are "noun clauses," and they are the subjects of the sentences.
Although the noun clauses have a subject and a verb, they are still nouns.

• two things contributed to a boy's popularity: his clothing style and athletic ability

• generally
-- the two clauses are connected by AND must be parallel
-- the noun-clause begins with the word how

THE PROMPT
Quote:
Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy dresses and his performance in athletics contribute to his degree of popularity.
• This phrase plays a big close to the fault line
-- Based on an adolescence study, behavioralists determined that . . .
The past participle (verbED) "based on" really refers to the work done by the behavioralists, not the behavioralists themselves.
This way would be better: Based on their interpretation of an adolescence study. behavioralists
• That phrase does not matter. It's not underlined.

[b]THE OPTIONS[/b]

Quote:
A) Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy dresses and his performance in athletics contribute to his degree of popularity.
how a boy dresses and his performance in athletics are not quite parallel
-- they are both noun phrases, but . . .
-- the noun phrase how a teenage boy dresses is not a "regular" noun—it's a noun that contains its own subject and verb
Such nouns are called noun-clauses, substantive clauses, nominal clauses, and something else I can' tremember.
X = how a teenage boy dresses (noun phrase)
Y = his performance in athletics (possessive noun)
• My eye did not catch the "how" error the first time through.
TENTATIVELY KEEP A

Quote:
B) Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy is dressing and will perform in athletics contribute to his degree of popularity
X = how a teenage boy is dressing - noun phrase
Y = will perform - verb
Not parallel.
• the verb tense shifted from is dressing (present continuous) to will perform (simple future)
-- not all different verb tenses in clauses connected by a conjunction lack parallelism!
-- Correct: He has not left the store and she is sitting outside, waiting for him.
ELIMINATE B.
Quote:
C) Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy dresses and his performance in athletics contributes to his degree of popularity.
• fatal: subject verb disagreement. Two things, plural, do not agree with the singular contributes to a teenage boy's popularity
ELIMINATE B

Quote:
D) Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy dresses contributes to his degree of popularity, along with his performance in athletics.

how the teenage boy dresses contributes both to his degree of popularity and to his performance in athletics?
• or how the teenage boy dresses AND his performance in athletics contribute to his degree of popularity.
KEEP D, but tentatively, and hope that E is better.

Quote:
E) Based on an adolescence study conducted in Berlin, behaviorists determined that how a teenage boy [i]dresses and how he performs in athletics contribute to his degree of popularity/i].
• Parallel and correct
X = how a teenage boy [i]dresses and
Y = how he performs in athletic
The two noun phrases are parallel. This option is better than A. The phrasing is clear and better than the murky (D).
Eliminate Options D and A

The best answer is E

Notes

For a good explanation of "noun-clauses," see Mike McGarry here.

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