Answer:
B. Confusion is more important to intellectual growth than it is to understanding your identity.
Explanation:
Confusion is a state in which human brain could not chronologically reconcile an information or expression. It is a required stage of learning because it motivates or builds the mind to decipher the appropriate way to solve a problem. Though it may lead to frustration sometimes, but it enables the development of a capacity for deeper level of understanding.
From 'The value of being confused', the central idea or theme is that confusion deals with the development of our intellect (knowledge and understanding), more than personal identity.
Everyone 
done his or her homework.
Explanation:
Everyone is singular and, therefore, require singular verb.
Your answer here is D. watches, worries
