The meaning of the word “criticize” has changed from “appraise”

The meaning of the word “criticize” has changed from “appraise” to “find fault with”. Such a change is called（ ）.
A、elevation
B、generalization
C、extension
D、degradation
【正确答案】：D
【题目解析】：criticize的意思从“评价”转变为“批评”，词义发生了降格。