The son was punished because he was ( ) to his grandfather.

The son was punished because he was ( ) to his grandfather.
A、friendly
B、kind
C、polite
D、rude
【正确答案】：D
【题目解析】：考核单词含义，句子含义是儿子被惩罚了，因为他对父亲粗暴相待。