It is A. Documents that were written in the past. It is in the past therefore part of history... (had to add some extra words to give the answer lol)
I think these are the answers:
A) My father doesn’t like dancing but I like dancing.
B) He failed his exam although he studied hard.
C) I didn’t attend my class yesterday because I was sick.
D) The phone rang while I was taking my online class.
E) We explore the internet so that we can learn many new things.
