It would be C. Informal because you are suppose to start business letters with Dear (Yourname) and it's the only one that does.
Answer:
my mom used peroxide to die my hair
Explanation:
peroxide is a medical chemical to help clean wounds however it can be used for other reasons
The anwser to your question is B. hope this help ;p
Well if someone ever felt little they would feel nervous or overwhelmed
The answer is An Egyptian pyramid