In preparing for their examination, some students believe that year round studies alone can guarantee success There are other who think following a planned study schedule and using study skills in the last month before examination is most effective​

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.

a conclusion based on evidence is an example of a. inference

i may be wrong but i think your answer is flashback