There is pollution in the countryside than in the cities.A. fewer B much C. less

问题补充：

There is pollution in the countryside than in the cities.

A. fewer B much C. less

答案：

解析：fewer更少的，修饰可数名词复数；much许多，大量；less更少的，修饰不可数名词。句意：乡下的污染比城市少。结合语境可知选C。