Sentence Correction
Verbal Ability

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Q.

It is usual for scientists and social scientists to abandon their theories only if another more attractive theory comes along and not when they have been proved incorrect.

 A.

their theories only if another more attractive theory comes along and not when they have been proved incorrect

 B.

a theory not because it has been proved incorrect, but because another more attractive theory comes along

 C.

their theories not when they have been proved incorrect, but because other more attractive theories come along 

 D.

a theory only when other more attractive ones come along, rather than when they are proved wrong 

 E.

their theories not if they have been proved wrong, but if another more attractive theory comes along

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Solution:
Option(B) is correct

In A, ‘they’ could refer to theories or scientists – the ambiguity is unacceptable. Choice B removes the doubt and has good parallel structure (not because... but because... ). C does not have such good parallel structure.

The ambiguity about ‘they’ is there again in D and E, both of which also change from singular ‘theory’ to plural ‘theories/ones’. Hence B is best.


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