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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: The earth and the sun are both celestial objects. The 
Completion A: earth is a planet. 
Completion B: earth orbits the sun. 
Completion C: sun orbits the earth. 
Completion D: earth and sun are both celestial objects.
Output:
Completion B