2.( ) is a process whereby a word of wide meaning acquires a

2.( ) is a process whereby a word of wide meaning acquires a narrower sense,in which it is applicable only to some of the objects it had previously denoted,or a word of wide usage is restricted in its application and comes to be used only in a special sense.For example,“meat” originally meant food and drink in general but it presently means flesh of animal used as food.
A：Extension of Meaning
B：Specialization of Meaning
C：Degradation of Meaning
D：Elevation of Meaning