
John M. answered 12/30/20
Student at the University of Alabama at Birmingham
The answer appears to be C. A pair of dashes sets off what is nonessential to the sentence. Because "lucky for me, lucky for them" is nonessential here, the whole phrase must go between the dashes. C is the only choice where the entire phrase is between both dashes.

Tim W.
I agree with John. All the same, it's a weird sentence structure and now I want to see the context of this sentence.12/31/20