Is having a donation/tip jar at the quality review station within the vita/tce site a violation of the volunteer standards of conduct?

a. yes
b. no

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.

can you give me a hint

what are the answers?