Question

Which is the correct way to combine the sentences to form one sentence with a compound subject? Surfers gathered on the beach. Sunbathers gathered on the beach. A. Surfers gathered on the beach, and sunbathers, too. B. Surfers and sunbathers gathered on the beach. C. Surfers gathered on the beach, and sunbathers gathered on the beach.

Answer 1

C is correct, but the subject is not a compound one, so it is not correct.
A  is really awkward, but it's not wrong. 

B is the correct answer because it is a compound subject.
Surfers AND sunbathers gathered on the beach. The and joins 2 nouns surfers sunbathers are the two nouns.