!please answer! which sentence describes voice rather than style

By comparing part 1 and 2 of polar opposites what does it mean by polar opposites

What can you infer about gregor from this excerpt? a. he is ungrateful and refuses to eat all of the food that grete brings for him b. his appetite is good, which shows that his body is trying to return to human form c. he always eats trash, and grete is trying to get him to remember being human d. his eating habits are changing, and he is becoming physically less human

Agood persuasive essay topic cannot be a. a fact b. debatable c. something somebody else has already written about