Marley sees Gretchen trip while walking along a corridor and he thinks to himself, "What a clumsy person!" Five minutes later, Marley slips at approximately the same segment of the corridor, and says to his buddy, "They must've just waxed the floors!. Boy it's slick." This is an illustration of the ______.

a) categorization effect

b) actor-observer effect

c) pass-the-buck effect

d) self-serving bias effect