Which Example Illustrates the Proper Way to Cite a Source

Multiple Choice

Which example illustrates the proper way to cite a source with two authors in a research report when the authors' names appear outside the body of the sentence?​

A) (Smith and Jones, 2005)
B) ​(Smith & Jones, 2005)
C) (Sam Smith and Bill Jones, 2005) "
D) (Sam Smith & Bill Jones, 2005)