Olga Buys a Bag of Potato Chips Every Day After

Olga buys a bag of potato chips every day after her economics class. The first potato chip always tastes wonderful. The second does not taste quite as good as the first. The third does not taste quite as good as the second. Olga is experiencing

A) irrational behavior.
B) the law of diminishing marginal utility.
C) the income effect.
D) the substitution effect.