Help me please i dont understand this

I'm not sure what you're asking, but if you're asking which circle to fill, I would say definitions, since that's what the text below contains.

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 "a" although apex might say best book of the year.