Answer:
shall we
Explanation:
because let's has the tag 'shall we'
I believe it's B! Participle phrases typically take the sentence and add some sort of modifier. An example of this that I've found is "Removing his pants, Ron jumped into the water to save the child." Another one is "The art museum, destroyed by a hurricane, was never rebuilt." The modifier can be removed from the sentence and it would still make sense.
