GMAT Sentence Correction (SC) | Re: Tropical bats play important roles in the rain forest

SPLIT1) PARALLELISM. HARD TO FIND BUT YOU MUST SEE IT. "AIDING", "POLLINATING" AND "HELPING" MUST BE IN PARALLEL. A,C, D AND E ARE OUT.

SPLIT2) IN E, "HELPING THE PRODUCING" SOUNDS WEIRD. MY QUESTION HERE IS WHETHER HELPING + INFINITIVE "TO" IS THE RULE AND WOULD MAKE IT RIGHT. I DONT THINK THIS IS CORRECT GRAMMAR.

NOTE ON THE SEMICOLON. THE USE OF THE SEMICOLON IS NOT A SPLIT IN THIS QUESTION. THE USE OF SEMICOLON IS CORRECT BECAUSE THE RULES
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