Suppose a gardener produces both green bean and corn in her garden. If she must give up 14 bushels of corn to get 5 bushels of green beans, then her opportunity cost of 1 bushel of green beans is ____
(A) 0.36 bushel of corn.
(B) 2.4 bushels of corn.
(C) 2.8 bushels of corn.
(D) 70 bushels of corn.