Parallel construction; use of "to" before & after "and"

Question

Hi guys,

am bit confused. when using correct parallel construction such as " to do x and to do y", is it ok not to use the word "to" again after and???

Question from Princeton Review warm up test:

Unreasonable weather in the months before a wine harvest can cool vineyards in the Bordeaux region enough  to affect the overall size of the grapes themselves, create  unwanted moisture that can cause mold in some grape varieties and deterioration in others

A) to affect the overall size of the grapes themselves, create
B) to affect the overall size of the grapes themselves, and create
C) That the overall size of the grapes themselves are affected, create
D) that it affects the overall size of the grapes themselves, creates
E) that the size of the grapes are affected and creates

OA is B

in the answer B why is there no "to" used after "and" and before "create"

Natia · Answer

When working parallel infinitives, it is acceptable to leave out the word "to" in all the infinitives after the first. Source: Manhattan GMAT SC

aknine · Answer

I agree with B
I think, the first thing to keep in mind is that there are 2 effects of unreasonable weather mentioned. 
i) cool vineyards enough to affect the overall size of the grapes
and
ii) create unwanted moisture that can cause mold in some grape varieties and deterioration in others

Separating the 2 with 'and' is enough, adding 'to' would not give more meaning to the sentence, so it would just be superfluous. Not required.

Target760 · Answer

Tx for your repsonses.

so let me try and understand it a bit differently; pls the case in which we are supoosed to repeat the "to" after the "and" . . .

shalu · Answer

the original sentence is an exampleof comma splice....so b is best

jeeteshsingh · Answer

Unreasonable weather in the months before a wine harvest can cool vineyards in the Bordeaux region enough  to affect the overall size of the grapes themselves, create  unwanted moisture that can cause mold in some grape varieties and deterioration in others

A) to affect the overall size of the grapes themselves, create
B) to affect the overall size of the grapes themselves, and create
C) That the overall size of the grapes themselves are affected, create
D) that it affects the overall size of the grapes themselves, creates
E) that the size of the grapes are affected and creates

Out of the 5.... C,D,E are anyway out as we need an infinitive.... hence left is A and B..

If u notice..... 'create unwanted moisture that can cause mold in some grape varieties and deterioration in others' is not parallel to the 'affect the overall size of the grapes themselves'. Instead it follows it in sequence. Hence you don't need these clauses to be in parallel. Rather you need a subordinate / conjunction to give a follow essence to the same. Hence in B it uses ', and create'. This suffices the need and hence it is correct!

Parallel construction; use of "to" before & after "and"

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