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.
Q: Prompt: The girls were unable to attend the school dance. The girls 
Completion A: organized the school dance. 
Completion B: were busy. 
Completion C: had a lot of free time. 
Completion D: finished their homework.
A: 
Completion B