Two mistakes
I just made the most amazing lettuce wrap's for today's potluck!

"wrap's"

Explanation:

You don't have to put an "'s" you can just say "warps"

b is the answer.   i sat on the lumpy sofa, totally exhausted, with a bad taste in my mouth, wondering what i should do next.  

i think the best answer would be d allowing 30 seconds between response would give time for what was already said to sink down in your mind.