Which sentence is MOST objective?

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.

Correct my question my english is not good: “what the effect and the effectiveness of strength exercise in breast cancer medication related to lymphedema? ”

Refer to the call of the wild to answer the question. what does the lost cabin symbolize for the men in the book? safety warmth power wealth