In “Señor Noboa,” why do the laborers turn their backs and refuse to look at Señor Noboa when he comes to visit?

Which sentence from a student's reflective essay contains a subject and verb error and needs to be edited? a. in my opinion, some of the voters seemed to need more information about their candidates. b. the documentary showed that dollars are often used instead of rubles in russia. c. the research shows that jackets made of wool are warmer than those made of cotton. d. in my opinion, either the doctors or the chief administrator need to make a quick decision.

Choose the option that includes the main claim in “the american promise”

Could someone me with this question?