Q: 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 2018 New York Democratic primaries were highly contentious. This is because 
Completion A: progressives ran against people in their same party. 
Completion B: the voter base was full of violent rioters. 
Completion C: New York is an autocratic system ruled by a horrible dictator. 
Completion D: New York Democrats are secretly Republicans.
A:
Completion A