Which of the Following Is Not a Reasonable Criticism of Research

Multiple Choice

Which of the following is not a reasonable criticism of research attempting to demonstrate language learning with nonhuman primates?

A) The animals' vocabularies are much less extensive than normal two- to three-year-old human children.
B) The animals' sentences are much less complicated than those of human children.
C) Judgments of what the animals are "saying" may be contaminated by experimenter bias.
D) The animals don't have a language acquisition device, so they can't really be learning language.