This is somewhat a specious GMATPREP question because of some lingering doubts. Of course
‘to manufacture’ is the right idiom and therefore no other choice but D will fit in.
That apart, the doubt is what the correlative conjunction
both modifies. If it modifies the two causes then it should just prior to those two causes and be called ‘
to both’ rather than
‘both to ‘. On the contrary, if
both modifies profits, it should be ‘
both to’ rather than ‘to both’. There seems to be no such possibility
Since there seem to be two causes, only ‘
to both’ should be declared appropriate in this case. However, as per this tenet, D and E are out.
If we can ignore
‘both to and to both’ muddle, then D is the choice. Should we deem not so, then there is no correct choice that satisfies both idom and appropriate word order
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