C
Step-by-step explanation:
A is wrong, DONT ever start with because (u can but it is informal, and no one asked, so this sentence is a statement sentence, not an answering-to-a-question kind of sentence)
B is wrong, cuz u cant place is after usually.
D is wrong, because it is not correct as it is, u cant put the word 'that' after period mark because it referse to the subject before it.