How does a heater use thermal energy please dont just copy paste random sh*t from google

A heater uses thermal energy by heating up its surroundings via radiation, a heater radiates the heat and then through the air and it eventually travels to you, it gets weaker as you get further because the heat molecules starts to disperse after a certian distance.

Explanation:

Thermal energy is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.

your answer would be a. 12.5 kg

it takes on an electronical energy