An Argument for Vegetarianism in the Book "Diet for a Small

An argument for vegetarianism in the book "Diet for a Small World" concludes that:

A) wasteful use of agricultural resources in raising animals for meat has led to world hunger
B) meat-based diets are less healthful than vegetable-based diets are
C) there are problems with the practice of factory farming
D) vegetarianism is an environmental imperative