Answer: The answer is A). Many of its claims are difficult to falsify
Explanation: The nativist theory is a biologically based theory, which argues that humans are pre-programmed with the innate ability to develop language. Noam Chomsky is a strong advocate for the nativist theory of language development.
Chomsky was known for his radical ideas about children being born with innate or "built-in" language devices. These claims are hard to falsify because there is no way to actually verify if at all human has an innate faculty for language.