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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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IMO E

Option A , B , And C have SV error.

Option D has Parallelism Error
Option E is correct with No SV error and no Parallelism error.

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Bunuel
Efforts made by York Laboratories to study how the atoms in metal crystals or other collections of tiny particles interact with one another, without having to move around individual atoms, has yielded interesting results and attracted the attention of several major research centers.

A. has yielded interesting results and attracted the attention
B. has yielded results of interest and has attracted the attention
C. has yielded interesting results and have attracted the attention
D. have yielded interesting results and attracted the attention
E. have yielded results of interest and have attracted the attention


Efforts "have" yeilded

Eliminate option A,B ,and C

E is unnecessary using verb twice and lengthy..
option D is concise and clear in meaning with no parallelism error

Ans D
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I think it is E, mainly because of "have" attracted
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The answer to this question has to be E, as it is the only option that doesn't have subject-verb agreement errors and parallelism errors.
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Answer is D. Has/have split. Eliminate A B C. "Results of interest" is needlessly wordy and you don't need to repeat "have" twice.

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Efforts made by York Laboratories to study how the atoms in metal crystals or other collections of tiny particles interact with one another, without having to move around individual atoms, has yielded interesting results and attracted the attention of several major research centers.

A. has yielded interesting results and attracted the attention Incorrect

SV error - Efforts plural, has singular

B. has yielded results of interest and has attracted the attention Incorrect

SV error - Efforts plural, has singular

C. has yielded interesting results and have attracted the attention Incorrect

SV error - Efforts plural, has singular

D. have yielded interesting results and attracted the attention Correct

E. have yielded results of interest and have attracted the attention Incorrect

results of interest - distort meaning,
D is better than E
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A. has yielded interesting results and attracted the attention : eliminated coz of subject verb agreement error.
B. has yielded results of interest and has attracted the attention:eliminated coz of subject verb agreement error.
C. has yielded interesting results and have attracted the attention:eliminated coz of subject verb agreement error.
D. have yielded interesting results and attracted the attention: This looks good.Parallelism is good . "Interesting" acts as an adjective and emphasises " results ".
E. have yielded results of interest and have attracted the attention : no subject verb error , parallelism is ok too but " results of interests " changes the meaning and no emphasis on "results".

D fits well.
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