James Spent Months Developing a Theory of Decision Making

James spent months developing a theory of decision making. But in an experimental test, only half of the participants responded as his theory predicted. James concludes that the rest of the subjects did not understand the directions and proclaims that the experiment is evidence in favor of his theory. This is an example of the

A) confirmation bias.
B) conversion effect.
C) "eureka" phenomenon.
D) gambler's fallacy.