Detailed Instructions: 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: Arthur pulled out the sword of Excalibur. He 
Completion A: must be super strong to pull out the sword.. 
Completion B: must just be lucky 
Completion C: must be the one destined to wield it. 
Completion D: must have used known a weak point in the stone.
A:
Completion C