Why does the author capitalize some common nouns?

In concrete mixers what seems to be the speakers feeling about the concrete mixers

Which sentence about subject-verb agreement is not true? a. singular subjects go with singular verbs. b. plural subjects go with plural verbs. c. when the subject and the verb go together, they agree. d. plural verbs go with singular subjects.

Our coach’s idea of food for the entire wrestling team was tiny sandwiches and fruit.