Answer:
a wet-carpet cleaner that carries it's own water supply has water pressure created by
D. motor- driven pump.
Explanation:
Faucet mixing valves can mix different sources of water current, but they need constant pressure provided by a pipe system.
Manual valves are the same as the first one, they required a pipe with pressure.
The solenoid valve like the first three options requires that the pipe provides the pressure it requires to free the water.
However, the motor-driven pump doesn't require a pipe with pressure because it can create pressure with the motor. So this is our correct answer.
