Trista's teacher just returned student essays to the class. Trista's teacher has written several positive comments throughout her paper and given Trista an A+ on the assignment. Trista is likely to believe her grade reflects because of .

quality of her work; the self-serving bias

Explanation:

Trista has attributed her success and outstanding performance in the test due to the quality she displayed in her work, she believes she put in much and as such deserves to score better than her mates. She also attributes this to her self-serving bias, self serving bias here is she's views herself as being favoured over her mates.

the true quality of her work; the self-serving bias

Explanation:

Trista is likely to believe her grade reflects the true quality of her work because of her self serving bias meaning that Trista believe that since her teacher has written several positive comments throughout her paper and given A+ on the assignment it means on her part that her hardwork or effort and self serving shows the true quality of her work and pave ways for her making her to have a good grade.

this doesn't support enough information to answer the question.