Answer: C) I think you left your biology notebook on the bleachers yesterday.
Explanation: homophones are two or more words that have the same pronuntiation but different spellings, meanings, or origins. In the given sentences we can see an example of a common pair of homophones: "your" (which means belonging to or associated with the person or people that the speaker is addressing) and "you're" (which is the abbreviation of "you are"). From the given options, the sentence that correctly uses the homophones is the corresponding to option C.