Question

what did noam chomsky call the \machine\ by which children learn language? universal syntax operant conditioning language structure language acquisition device

Explanation:

Noam Chomsky proposed the concept of the "Language Acquisition Device (LAD)", which he described as an innate mental structure that enables children to learn language. "Universal syntax" is related to his theory of universal grammar but not the term for the learning "machine". "Operant conditioning" is a behavioral learning concept (from B.F. Skinner, not Chomsky). "Language structure" is a general term and not Chomsky's specific term for the language - learning mechanism in children.

Answer:

D. language acquisition device