Which sentence demonstrates
proper subject/verb agreement?
[Remember, "everybody" is a
singular pronoun.]
A. Everybody in the groups want to see that
monument.
B. Everybody in the groups are wanting to see that
monument.
C. Everybody in the groups wants to see that
monument.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

this question is grammatically incorrect and is illegible to me so i can not answer.