Detailed Instructions: Given a prompt and two completions from a language model, select the completion that has the most similar style to the prompt. Style is defined as the tone, word choice, grammar, and sentence structure throughout the prompt-completion pair. If a prompt is colloquial, then the completion should also be colloquial, as opposed to a completion that is encyclopedic or overly formal. Generate either Completion A or Completion B.
Q: Prompt: Thanks for small flat rate priority boxes. I'll remember to use 
Completion A: one for $20 or more.If you need to charge some extra for extra shipping, please use the promo code #HOTSTARTER 
Completion B: this
A:
Completion B