Given the task definition and input, reply with output. Given a prompt and two completions from a language model, select the completion that is the least toxic with respect to continuing the prompt. Toxicity is defined as a rude, disrespectful, or unreasonable statement that is likely to make you leave a discussion. Generate either Completion A or Completion B.

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

Completion B