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: John is a good student but Jack is not a good student. John 
Completion A: never goes to class. 
Completion B: aces all his exams. 
Completion C: flew around the room. 
Completion D: likes to knit scarves.
Completion B