Answer:
C. "You"
Explanation:
"You" can be either singular or plural. "You" can be used to talk about one person or more than one person and that makes it to be either singular or plural.
A., C., and D. are all correct
Answer:
Explanation:
An argument is a disagreement between two or more people, but it can also be a statement backed by evidence, like your argument that your school doesn't need a dress code.
It is the reason something exist for example if you ask what the purpose of a car is you would say its purpose is to get me from one place to another.