Ehrenreich states that one of the advantages of a corporate cleaning service compared to hiring an individual maid is that
A. hiring a corporate cleaning service is usually cheaper than hiring an individual maid
B. corporate cleaning services do a better job of cleaning
C. corporate cleaning services provide more flexible work hours to accommodate the customers'
schedules
D. corporate cleaning customers don't communicate with maids directly but rather with the
management of a corporate cleaning service
E. corporate cleaning services treat their employees better, therefore, it is politically correct to
support them financially

The answer is D

Explanation:

Ehrenreich says, "This, I suppose, is one of the  advantages of a corporate cleaning service to its customers: there are no sticky and possibly guilt-ridden relationships involved, because the customers communicate almost  entirely with Tammy, the office manager, or with Ted, the franchise owner and our boss."

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.