Which of the following is NOT one respect of the rhetorical feat

Which of the following is NOT one respect of the rhetorical features of idioms?（）
A、Phonetic manipulation
B、Lexical manipulation
C、Syntactical manipulation
D、Figures of speech
【正确答案】：C
【题目解析】：习语的特征。由对习语不同的特征的认识可知该题选C。