Which of the following best states the main idea of the passage？A．Noise is a major problem

Which of the following best states the main idea of the passage？

A．Noise is a major problem; most people recognize its importance.

B．Although noise can be annoying, it is not a major problem.

C．Noise is a major problem and has not yet been recognized as such.

D．Noise is a major problem about which nothing can be done.