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Preservingtheenvironmentisanissueofcrucialimportancetoushumanbeings,closelyrelatedtothesustainabledevelopmentofeconomy.A.whichB.oneC.itD.this为什么这里不能用which,而是one?

题目详情
Preserving the environment is an issue of crucial importance to us human beings,_____ closely related to the sustainable development of economy.
A. which B. one C. it D. this
为什么这里不能用which,而是one?
▼优质解答
答案和解析
这里的one指代的是人us human beings
后面那句话是想说明是哪一类人.
如果选which就把句子想表达的意思弄错了