In an experiment, two hundred mice of a strain that is normally free of leukemia were given equal doses of radiation. Half the mice were then allowed to eat their usual foods without restraint, while the other half were given adequate but limited amounts of the same foods. Of the first group, fifty-five developed leukemia; of the second, only three.

The experiment above best supports which of the following conclusions?

(A) Leukemia inexplicably strikes some individuals from strains of mice normally free of the disease.
(B) The incidence of leukemia in mice of this strain which have been exposed to the experimental doses of radiation can be kept down by limiting their intake of food.
(C) Experimental exposure to radiation has very little effect on the development of leukemia in any strain of mice.
(D) Given unlimited access to food, a mouse eventually settles on a diet that is optimum for its health.
(E) Allowing, mice to eat their usual foods increases the likelihood that the mice will develop leukemia whether or not they have been exposed to radiation.