Please help meh -_-

Which pronoun agrees with the antecedent?


Both dogwoods and oak trees drop __________ leaves seasonally.


A.

its


B.

their


C.

theirs


D.

they

I think it's either A or B.

Verified Answer :

The answer is B their you wouldn't say dorp its leaves.

Do you know what an antecedent is? preceding in time or order; previous or preexisting.(`google) Their, (b) is the one I would lean towards... :) 
Answer: B. Their