What words are used to signal counterarguments?

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.

Men sample of a metaphor? o a she was as busy as a bee. o b, his room was like a prison. o c. she has a heart of stone, d. she is an uncaring person.

Who first discovers the alien cylinder on horsell common