Instructions: In this task, you will be presented with a question having multiple possible answers in Chinese language. And you should choose a most suitable option out of "A", "B", "C", "D", and "E" based on your commonsense knowledge.
Input: Question: 丹喜欢下棋，但他就是下不了了。  他被什么削弱了？ 
 Options: A 无聊 B 谦逊 C 头痛 D 挫折 E 关节炎 
Output:
C