Firstly, Conditional past real mood is a statement where one explains what they would have done if some event had occurred, or what could happen, in other words, a theoretical action. The tense will be dependent on the action. Therefore, the only one that fits is C "If I had homework, I would have studied at the library." I properly states their theoretical scenario in which they had homework.
False courage will be the answer<span />
B. hints that tell a reader what is going to happen in a story :)
I am assuming that this question is asking you to correct this sentence. Here is the revised sentence: "You forgot that you took my blanket too."