Final answer:
The theory that explains why Dominica is more likely to claim the test was unfair rather than admit she didn't study hard is self-serving bias.
Step-by-step explanation:
According to the given options, the theory that Dominica is more likely to claim the test was unfair rather than admit she didn't study hard is self-serving bias (option A).
Self-serving bias is the tendency to attribute our successes to dispositional factors and our failures to situational factors. In this case, Dominica wants to protect her self-esteem by attributing her poor performance to external factors like the test being unfair, rather than internal factors like not studying enough.