Answer:
The answer is Noam Chomsky.
Explanation:
Noam Chomsky, who is a linguist, proposed a theory that in everyones brain there is a certain part that is responsible for language learning called Language Acquisition Device (LAD) and he proposed that this device was responsible for the incredible speed at which babies acquire languages. So the answer to the theory given in the question is Noam Chomsky.
I hope this answer helps.
