Which of the following is NOT the extra-linguistic factor that c

Which of the following is NOT the extra-linguistic factor that causes changes in meaning?（ ）
A、Historical reason.
B、Class reason.
C、Political reason.
D、Psychological reason.
【正确答案】：C
【题目解析】：本题考查词义变化的非语言因素。historical reason：历史原因；class reason：阶级原因；political reason：政治原因；psychological reason：心理原因。ABD三项都是词义变化的非语言因素，故答案为C。