Dave Is Undecided About Whether to Eat at a Restaurant

Multiple Choice

Dave is undecided about whether to eat at a restaurant or to order pizza at home. He then obtains a coupon for 20 percent off at the restaurant and decides to go there to eat. This is an example of

A) someone using criteria other than price to make a consumption decision.
B) a lower price leading a consumer to substitute more of the less expensive good for the relatively more expensive good.
C) a lower price leading a consumer to buy more of a good because of the income effect.
D) a consumer making a decision irrationally.