In Shakespearean line “Rats and mice and such small deer”， “deer” obviously designates “animal” in general. Therefore “deer” is a typical example of（）.

In Shakespearean line “Rats and mice and such small deer”， “deer” obviously designates “animal” in general. Therefore “deer” is a typical example of（）.
A、extension
B、elevation
C、narrowing
D、degradation
正确答案：C