请教一道语法题

1。The Kenyan government, working closely with conservation groups, has proposed a plan that would require developers who own land within elephant habitats follow strict rules limiting new developments so as to protect the elephant population.

A. follow strict rules limiting new developments so as to protect

B. to follow rules strictly limiting new development in order to protect

C.

D. to follow strict rules limiting new development for the protection of

答案是B， 可是我认为D对。麻烦谁帮我解释解释。谢谢！