which of the following is an example of a subject of a book? choose one option\na dolphins can communicate…

which of the following is an example of a subject of a book? choose one option\na dolphins can communicate with one another.\nb dolphins\nc whistling is one way that dolphins talk to each other.\nd have you ever heard a dolphin?
Answer
Brief Explanations:
A book subject is a general topic. Option A and C are statements about dolphins (specific facts), option D is a question. Option B "dolphins" is a general topic.
Answer:
B. dolphins