Final answer:
Vygotsky's social learning theory would provide the best support to the idea that mirror neurons are involved in language acquisition.
Step-by-step explanation:
The theory that would provide the best support to the idea that mirror neurons are involved in language acquisition is Vygotsky's social learning theory. Vygotsky's theory proposes that language acquisition is a result of social interaction and the influence of more knowledgeable individuals. Mirror neurons, which are involved in mimicking and imitating actions, would play a crucial role in the process of learning language through observation and imitation.