Match the lack of subject-verb agreement solution to the correct

lack of subject-verb agreement problem: A noun of amount as the subject
Solutions:
a. Determine whether the noun of amount refers to one unit and is
therefore singular or whether it refers to a number of
individual units and is therefore plural.
b. Make the verb agree with the subject, which is never the
object of the preposition.
c. If the collective noun refers to a group as a whole, use a
singular verb, or if the collective noun refers to each member
of a group individually, use a plural verb.
d. Ignore the predicate nominative, and make the verb agree with
the subject of the sentence.
e. In an inverted sentence look for the subject after the verb.
Then make sure the verb agrees with the subject.

1. The amount of people attending the concert are staggering.

Solution: a. Determine whether the noun of amount refers to one unit and is therefore singular or whether it refers to a number of individual units and is therefore plural.
Corrected sentence: The number of people attending the concert is staggering.

2. The team, along with its coaches, are celebrating their victory.
Solution: c. If the collective noun refers to a group as a whole, use a singular verb, or if the collective noun refers to each member of a group individually, use a plural verb.
Corrected sentence: The team, along with its coaches, is celebrating its victory.

3. The winner of the race is him.
Solution: d. Ignore the predicate nominative, and make the verb agree with the subject of the sentence.
Corrected sentence: The winner of the race is he.

4. Was the cupcakes baked by you or her?
Solution: e. In an inverted sentence look for the subject after the verb. Then make sure the verb agrees with the subject.
Corrected sentence: Were the cupcakes baked by you or her?