There Can Be No Defense of Eating Flesh in Terms

There can be no defense of eating flesh in terms of satisfying nutritional needs, since it has been established beyond doubt that we could satisfy our need for protein and other essential nutrients far more efficiently with a diet that replaced animal flesh by soy beans, or products derived from soy beans, and other high-protein vegetable products. (Peter Singer, Animal Liberation)
This statement is made up of a(n) _____ and a(n) _____.

A) nonargument; explanation
B) argument; conclusion: There can be no defense of eating flesh in terms of satisfying nutritional needs
C) argument; conclusion: It has been established beyond doubt that we could satisfy our need for protein and other essential nutrients far more efficiently with a diet that replaced animal flesh by soy beans, or products derived from soy beans, and other high-protein vegetable products
D) nonargument; unsupported assertion