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】：造成词义变化的非语言因素包括历史原因、阶级原因和心理原因。不包括C。