Read the following passage.

"Hey," Donald called out. "Have you noticed this place is a catastrophe?"
Kevin surveyed the house--plates stacked in the sink, coffee stains on the kitchen floor and laundry strewn about. It was all the debris of a week without parents.
"When does Dad come back again?" They both looked at the clock. Two hours.
Kevin scavenged for bleach, and Donald clambered for soap. Scrubbing, disinfecting, folding and spritzing, they sweated their way through a fast-paced cleaning regime that would have impressed the most thorough of housekeepers. An hour and fifty minutes later, they heard the key turn in the lock. Their dad came through the door. The whole house had been cleaned. But Donald and Kevin had both collapsed in puddles of exhaustion on the couch.

Which of the following revisions to the underlined sentence is in the active voice?

A
Bleach and soap had been used to clean the whole house.

B
The whole house had been cleaned by Kevin and Donald.

C
Donald and Kevin had cleaned the whole house.

D
By then, the whole house had been cleaned.