49.

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

The underlined part is a complete sentence before and after, so it is correct to use the coordinating conjunction and to connect.

B item: which guides the attributive clause, which needs to be the subject or object in the attributive clause, and the following sentence does not lack the subject or object.

Item C: who is cannot be connected with the following sentence, wrong.

Item D: There is no conjunction to connect two sentences, wrong.