Anytime You Use the Work of Others, You Must

Anytime you use the work of others, you must:

A) provide a citation indicating in the text of your paper only the year of the work you are using.
B) provide a citation indicating in the text of your paper what idea you are using and whose idea it is.
C) decide whether or not to cite the author or to leave the citation out.
D) provide a citation in the bibliography or list of references only.