The word manuscript used to mean "handwriting", but now it means

The word manuscript used to mean "handwriting", but now it means "any author's writing whether written by hand or typed with a typewriter or a word-processor".This is an example of _____ of meaning.
A、extension
B、narrowing
C、degradation
D、elevation
【正确答案】：A
【题目解析】：“手稿”这个词过去指的是“手写”，但现在它指的是“任何作者的作品，无论是手写的还是用打字机或文字处理机打出的”。这是词义引申的一个例子。