"I picked the wrong checkout line. I chose a short line and then found out that the person in front of me had three items without price tags."

Which of the following correctly explains how a mainstream economist would describe the reported behavior?

A. Irrational because the wait turned out to be longer than necessary.
B. Rational because all behavior is rational.
C. Irrational because the person forgot to obtain needed information.
D. Rational because it is too costly to ask everyone in line about their items.