We can see the author is arguing against ridgetop development, but we can also see he has made an appeal in the last paragraph. It says, "Ridgetop development must be stopped while thoughtful, effective measures are put in place to restrict future development."
Thus, we can come to the conclusion that the best choice/answer would be:
B. Development should be stopped temporarily while restrictions are put in place for future housing developments.
It basically restates the appeal made by the author.
