Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.    

A notice ________ today's special event is posted on the bulletin board.

• A. A. shown
• B. B. showed
• C. C. showing
• D. D. show

Rút gọn mệnh đề quan hệ. "A notice which shows today's special event."