When should you use an in-text citation?

I think it is C.

A. only at the end of the paper

B. every time you use a fact or a piece of information from a source.

C. only if you use the same source two or more times in a row.

D. only if you use three or more facts from that source

2 answers

Definitely not C.
http://writingcenter.waldenu.edu/33.htm

Please read the 2nd paragraph very carefully.