Sentence Correction

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
when in that is preffered over because

"C" Correct Answer.

The yield varies because of so and so reason.This clearly states the cause and effect.

Because is used to indicate cause and effect.