Observation shows that it is much more common for word meanings

Observation shows that it is much more common for word meanings to change in denotation from neutral to （） than it is for them to go the other way.
A、important
B、agreeable
C、respective
D、pejorative
【正确答案】：D
【题目解析】：一个词很容易由中性词变到贬义词，反之却很难。