Answer: c) I think you left your biology notebook on the bleachers yesterday.
Explanation: an homophone is a group of two or more words that have the same pronunciation but different meanings or spelling. A very common homophone is your (second person possessive adjective, it is used to express belonging) and you're (contraction of you are). In the given sentences the only one that has a correct use of one of this words is the option "c" because it says "your biology notebook", we can see that "your" is used to express the belonging of the notebook.
