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: Justin is at a swimming race and gets ready. He 
Completion A: can't wait to start jumping into the pool 
Completion B: swims into his dreams 
Completion C: waits for the start sound and prepares 
Completion D: waits for his mom to watch him swim
Completion C