Read the following​ sentence, and then select the group of words that consists of only nouns.

B.F. Skinner​ (1904-1990) is considered by many to have been the greatest behavioral psychologist of all time.

A.

​Skinner, many, time

B.

​many, behavioral, time

C.

​Skinner, greatest, psychologist

D.

​Skinner, psychologist, time