It is possible to conclude that his behavior is consistent with self-serving bias, based on the information available about Doug.
The term "self-serving bias" refers to the situation in which an individual takes personal credit for their own successes but not for their own failures.
According to the preceding, Doug's behavior is consistent with the self-serving bias because he believes that his successes are the result of his hard work and his failures are not.
Thus, Doug is most clearly demonstrating self-serving bias.
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