If you accept either C or D as the correct revision then you have to accept both of them. Hence the best way to treat the sentence is to ignore both of them.
B is not correct either. You can over punctuate.
That leaves A.
Sometimes the right answer to many things is to do nothing. My dad used to say "Don't fix what isn't broke."
A is the answer <<<<<
The correct answer is A. Subjective narrator.
When a narrator is subjective, this one expresses or adopts the point of view of a specific character in the story. He usually knows what the character feels or think, but not what the other characters maybe thinking or doing. He has a limited vision of what is occurring in the story.
Answer:
Some people like dogs, others prefer cats.
Explanation:
You can add a comma after dogs.
