O Which of the following is the most likely use of alfalfa?
to top a sundae
to feed cattle
to fuel an automobile
to increase reading speed

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 "began" because it is a action that can be done

harry says he would trade a gold mine for a glass of water.