When Jill tried on a very fashionable but expensive coat, she thought it looked great. However, she initially felt guilty about buying the coat because she couldn't afford it. Later that night, she rationalized her decision by saying that the coat is one of a kind, and considering how lovely it looks, it is quite a bargain. This example illustrates:a) informational social influence
b) the self-serving bias
c) the self effacing bias
d) hindsight bias