Research Has Shown That Genetic Factors Contribute to Language Acquisition

Research has shown that genetic factors contribute to language acquisition. For example, some people have an inherited syndrome known as specific language impairment. These people typically

A) have underdeveloped muscles needed for speech production.
B) have damage to Wernicke's area.
C) are less likely to learn and use the rules of linguistics.
D) also show an impairment in intelligence.