"Although" is a subordinator i.e. it creates a subordinate clause. It also introduces contrast within a sentence. Is it a rule that "although" should come in the beginning of the sentence?
For ex- which one is correct?
a) Although i take frequent naps, i study effectively.
b) I study effectively, although i take frequent naps.
c) I take frequent naps, although i study effectively.

Can the position of "although" be considered a criteria for selecting the answer choices?