Given the task definition and input, reply with output. Given a prompt and two completions from a language model, select the completion that is more topical with respect to continuing the prompt. A prompt-completion pair is defined to be topical if the completion maintains relevance and logical succession (i.e. stays on topic) with the prompt. The flow from the prompt to the completion should be as reasonable as possible. Generate either Completion A or Completion B.

Prompt: Thanks for the small flat rate priority boxes. I'll remember to use 
Completion A: one for each order and they are great choices for a few months. So a flat rate package? We'll let you know the next time you receive 
Completion B: those for the other priority boxes. I'll also do the "first letter of the alphabet" priority. I've also put together my preferred priority bo

Completion A