Read the sentence.
A student who is writing a summary about Helen killer wants to cite information From page 16 of the miracle worker by William Gibson.

Which answer Choice is the correct internal citation for the quote?

A. (Keller 16.).
B. (Gibson 16).
C. (Miracle worker, 16).
D. (Gibson,p. 16).

What is the answer I cannot figure it out. Please someone help me!!