一道语法题

galfield

greenpeace, (an internaitonal) organization of environmental activists founded by Canadians, uses nonviolent (means) to protest and block activities( it) considers environmentally (harm)

答案D harm->harmful  是对的,但我想不通为什么用it, 而不改为that or which

yongchou

it--refers to -->Greenpeace.
If you use "that or which" here, they become---> activities.