Which of the Following Individuals Is Showing the Self-Serving Bias

Which of the following individuals is showing the self-serving bias?

A) Eira, who believed that she passed a test because it was easy but then failed her assignment because her prof marked it unfairly
B) Hannah, who believes the waiter spilled her drink because he was clumsy but believed when she spilled her own drink it was because the glass was slippery
C) Rupan, who believes that she swerved to avoid hitting a deer and missed due to her fast reflexes but then ended up going off the road because the sun got in her eyes
D) Sacha, who believes that she dropped a glass because she was clumsy but then washed a sink full of glasses because she felt guilty