The answer is B
Explanation: personally I do not think any other option makes sense!
The answer to your question would be prohibited as it does mean to be forbidden or not allowed to and on this sentence is saying that since it was too noisy it was impossible to study.
Answer:
Since you write an email to a cousin , your email will be informal.
you begin with "Dear Cousin,"
then say hi and ask about his news and tell him yours. (1st paragraph)
(2nd paragraph) You say you heard that he doesn't want to eat vegetables and how you received the news. You'll explain to him in a friemdly manner the benefits of vegetables and the consequences of not eating them. (staying healthy , his body is in need of vitamins for growth,,etc)
then you end your email by suggesting him to eat a different kind of vegetables or cook them differently or whatever and that you wish he would think again and change his mind about it.
I had to work very hard, riding my bike. I had to get in shape and all that stuff. Last year I won state and got 8th in nationals all because I worked for it!