Answer:
C.
Explanation:
Basically, you are looking for the sentence that is clear in what it is saying.
A is not clear because it is saying that your aunt used the attic, and that is where you found the lamp.
B. is saying that your aunt used the lamp while she was in the attic.
C. says that in the attic, you found the lamp that your aunt had used before.
A and B can be confusing with the way the words are arranged, so that's why C is correct
Hope this helps. Sorry if it is confusing
