Its D. Shes too young and not ready for another 2 years
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>
The correct answer choice is D
Advantages means something that gives you a higher chance of achieving something. For example, an advantage in a race is good stamina.