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) (Palmer and Ziser, 2017)
B) (Palmer & Ziser, 2017)
C) (Eleanor Palmer and David Ziser, 2017)
D) (Eleanor Palmer & David Ziser, 2017)