The yield per acre of coffee berries varies enormously in that a single tree, depending on both its size and on climate and altitude, could produce enough berries to make between one and twelve pounds of dried beans a year.
A. enormously in that a single tree, depending on both its size and on climate and altitude, could produce
B. enormously in that a single tree, dependent on its size and also on climate and altitude, is able to produce
C. enormously, because a single tree, depending on its size and on climate and altitude, is able to produce
D. enormously, because a single tree, being dependent on its size, climate, and altitude, is capable of producing
E. enormously, because a single tree, dependent both on its size as well as on climate and altitude, could produce

Ron, or another expert, I got this question correct with C; however, what is the deal with the parallelism? On its size and On clime and altitude . Why is that allowed as it is not perfectly parallel? I know this is a miniscule question, but if that is allowed I need to notate that under my parallelism rules I am attempting to follow.

Thanks
-BP