Doris, a burglar who breaks into houses, decides to break into the house at 265 Elm Street, rather than the house next door because the house next door has a sign in the yard that says "home protected by a security system." To an economist, Doris is ______.
a. making an irrational choice.
b. making a rational choice.
c. not fully considering the personal costs and benefits of her decision.
d. not responding to the incentives she faces.