Susan Usually Does Well on Her Written Assignments and She

Susan usually does well on her written assignments and she says this is because she works really hard.But when she gets a bad grade on her last written assignment,she says it is because the teacher does not like her.Her explanations show that she is making a

A) self-serving bias.
B) reflected appraisal.
C) better-than-average effect.
D) downward comparison.