Which of the following sentences comes after "Dear Sir or Madam"？A．To whom it may concern.

Which of the following sentences comes after "Dear Sir or Madam"？

A．To whom it may concern.

B．We would like to announce a special price discount.

C．We are very grateful for your support.

D．Please return the survey without delay.

请帮忙给出正确答案和分析，谢谢！