单选题:目前,在我国的的许多地区,小造纸厂、小化工厂、小炼油厂遍地开花,造成了严重的环境污染,但却未付出相应的补偿。从经济学的角

题目内容:
目前,在我国的的许多地区,小造纸厂、小化工厂、小炼油厂遍地开花,造成了严重的环境污染,但却未付出相应的补偿。从经济学的角度看,上述现象属于( ) A.外部不经济
B.自然垄断
C.信息不对称
D.外部经济

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