For a weeks, you are stuck thinking whether you should buy a Sony MP$3$ player or an Apple iPod. You have just purchased a Sony MP$3$ player. As you head home from the store, you debate in your mind about whether your choice of the Sony was right or whether you should have chosen the Apple iPod. This is most likely an example of

A$.$ involvement.

B$.$ cognitive dissonance.

C$.$ market domination

D$.$ public sources.

E$.$ extended problem solving.