A spacecraft crash lands on an airless, lifeless moon. All that survives, along with the crew, are some chickens, cornflakes, and vitamins. The air and water recyclers are functioning. To maximize their food supply until rescued the crew should

A)feed the cornflakes and vitamins to the chickens, then eat the eggs until rescued.
B)kill all the chickens immediately, eat them first, then eat the cornflakes.
C)mark each week's survival by eating one chicken.
D)ration the chickens first; when they are all eaten, shift to the cornflakes.