Read the following sentence, and then select the group of words that consists of only nouns. His work in the 1930s consisted primarily of laboratory experiments in learning, using pigeons as subjects. A. work, primarily, laboratory, subjects B. his, work, experiments, learning C. his, the, consisted, pigeons D. work, experiments, pigeons, subjects

D.  work, experiments, pigeons, subjects

Explanation:

These words are all nouns.

where is the writing? (so i can answer)

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.