Everyone has his or her advantages, and only _______ you do best can help to reach the goal and trul

Everyone has his or her advantages, and only _______ you do best can help to reach the goal and truly make a difference.

A.discovering what

B.discovering whose

C.by discovering what

D.by discovering which

答案及解析： A

解析：

discovering what…是动名词短语作主语，what引导宾语从句又在从句中作宾语。