Given a prompt and four completions, select the completion that is the most plausible in continuing or answering the prompt. This task is designed to test common sense and has various categories ranging between idioms, negated statements, polysemy, subject referencing, and quantitative reasoning. Generate either Completion A, Completion B, Completion C, or Completion D.

Prompt: Bob used to fail every class but then he started working really hard. He
Completion A: gets good grades now.
Completion B: gets bad grades now.
Completion C: fails everytime.
Completion D: doesn't go to tests.
Completion A