The answer to this question is the <span>American
linguist, philosopher, and cognitive scientist, “Noam Chomsky”. He is </span>sometimes described as the father of modern linguistics. <span>The
nativist theory he proposed states that humans are pre-programmed with the
ability to develop language. </span>
Formal language is also called "proper language" because it is the type of language you would use when first meeting someone or giving a speech at a high class place so the correct answer is:
<span>B) Have I convinced you that the study of grammar is important and well worth your effort? </span>
D) Did you read the long, interesting essay Betty wrote?