The term hierarchy refers to
a. a situation in which higher species such as men will always be in control of lower species such as animals.
b. a condition in which the weak must die so the strong can survive.
c. a team in which everyone is equal and has to pull his or her own weight.
d. a power structure in which each member knows his or her own place.

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.

i think there should be answer choices