In Shakespearean line “Rats and mice and such small deer”, “deer

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
【题目解析】：在题干引文中deer指动物，而当代英语中deer特指“鹿”这种动物，所以这个词的范围是被缩小的。