Suppose Jeffrey consumes three pieces of pizza one evening. He figured the last one was just worth the price he paid for it. If each slice he buys have a price of $1.50, then:

a. he earned no consumer surplus

b. he would have earned consumer surplus if he had eaten one more slice

c. he was irrational

d. he may have earned consumer surplus on the first two slices

e. he earned $1.50 consumer surplus on the third slice alone