求助一道GMAT语法题~Tropical bats play important roles in the rain f

求助一道GMAT语法题~
Tropical bats play important roles in the rain forest ecosystem,aiding in the dispersal of cashew,date,and fig
seeds; pollinating banana,breadfruit,and mango trees; and indirectly help produce tequila by pollinating agave
plants.
(A) pollinating banana,breadfruit,and mango trees; and indirectly help produce
(B) pollinating banana,breadfruit,and mango trees; and indirectly helping to produce
(C) pollinating banana,breadfruit,and mango trees; and they indirectly help to produce
(D) they pollinate banana,breadfruit,and mango trees; and indirectly help producing
(E) they pollinate banana,breadfruit,and mango trees; indirectly helping the producing of
这道题C为什么错,不是说分号后面也要接一个完整的句子吗