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: Derrick is a school teacher. Derrick 
Completion A: organizes a coup 
Completion B: grades papers 
Completion C: teaches dolphins how to fly 
Completion D: teaches giraffes math
Completion B