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