How is a diary, such as pepys’s, different from a history such as bede’s? a. a diary is usually more personal. b. a diary is usually more objective. c. a diary is usually more formal. d. a diary usually lacks historical accuracy.

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.