Which of the following is NOT the extra-linguistic factors that

Which of the following is NOT the extra-linguistic factors that cause changes in meaning?
A、Class reason.
B、Historical reason.
C、Political reason.
D、Psychological reason.
【正确答案】：C
【题目解析】：语义变化的非语言因素包括class reason, historical reason 和psychological reason, 因此，根据题意C项是答案。