The percolating temperature of an automatic percolator is kept at the desired level by the?

The correct answer for the question that is being presented above is this one: "A. Thermostat." A percolator is a coffee-making appliance which hold the ground coffee in a strainer As the water heats, it is pumped and circulates through the coffee.

Here are the following choices:

A. Thermostat.

B. Automatic valve.

C. Low-heat element.

D. ON/OFF switch.