Question

Which homophone best completes the sentence?

Answer 1

Hi!

Every fall, the oak tree in the garden sheds its leaves.

The answer isn't their, because there is only one tree.
It isn't there because there isn't used as a possessive noun. 
And it isn't it's because it's means it is. 

So the answer is its.

Hope this helps! :)

Answer 2

The correct one would be the oak tree sheds its leaves.

Their is only used for people "Their book is gone!"
There isn't used for ownership. "There! I'm done."
And It's is a contraction for "it is".

D would be correct, its.