【单选题】Freddy has eaten three corn dogs at the county fair and knows that if he eats another, he will get sick on the roller coaster. Knowing this, and ignoring any impact that price might have on his decisi...
A.
total utility of the fourth corn dog is less than zero.
B.
marginal utility of the fourth corn dog is less than zero.
C.
total utility curve is still increasing at the fourth corn dog.
D.
marginal utility curve is still increasing at the fourth corn dog.