Questions: Language acquisition device (LAD) is the innate ability built into the human genetic code to: understand and use language. form the sounds of words. communicate through gestures. learn through reinforcement.

The answer is understand and use language.

The Language Acquisition Device (LAD) is a theoretical concept proposed by linguist Noam Chomsky. It suggests that humans are born with an innate ability to understand and use language. This theory posits that the human brain is pre-wired to acquire language, which explains why children can learn complex languages quickly and efficiently.

While forming the sounds of words is a part of language acquisition, the LAD specifically refers to the broader ability to understand and use language, not just the phonetic aspect.

Communicating through gestures is a form of non-verbal communication and is not directly related to the LAD, which focuses on the acquisition of spoken and written language.

Learning through reinforcement is a concept associated with behaviorist theories of learning, such as those proposed by B.F. Skinner. The LAD, on the other hand, is a nativist theory that emphasizes innate biological mechanisms rather than learning through reinforcement.