letting every one know that on Edunuity 2020 for each question , everyone doesn't have the same letter answer (like a, b, c, or d) Edge just does it that way. So when you put a question on don't just put the letter put what it says too, so that its not that confusing. Have a good day ;) .

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.

the answer is   b suffix addition