Given the task definition, example input & output, solve the new input case.
Given a prompt and two completions from a language model, select the completion that is the most fluent with respect to continuing the prompt. Fluency is defined by coherency and ease of understanding, not necessarily grammatical correctness. Generate either Completion A or Completion B.
Example: Prompt: Im 99 percent sure it was someone being an 
Completion A: accomplice , or maybe just plain old con man . whatever it was , it 's over . " 
Completion B: asshole, your right?) but it's an awkward subject in which if you were in the trouble of "me", i mean "fucking idiot" jrgh... i dunno...I guess you are (in a legal context) not a stupid
Output: Completion A
This prompt-completion pair is more fluent because it is more easy to follow and is a realistic statement.

New input case for you: Prompt: I never understood the reason for the different tracks. I just can't 
Completion A: understand why you guys want to play this. They were like "You can play some bass and stuff" which is kind of like you're playing like 
Completion B: imagine any more reason."  "The last track is just a simple song, it's just me and my guitar," continued Nadella
Output:
Completion A