The extra-linguistic factors that cause changes in word-meaning

The extra-linguistic factors that cause changes in word-meaning include the following EXCEPT（） .
A、historical reason
B、psychological reason
C、geographic reason
D、class 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。