Correct option is A
Heat is a form of energy, and the SI unit of energy is the Joule (J). Heat energy is transferred between objects due to a temperature difference, and it is measured in Joules (J) in the International System of Units (SI).
· 1 Joule (J) = 1 Newton meter (N·m) = 1 kg·m²/s²
· Heat is also sometimes measured in calories, where 1 calorie = 4.186 Joules.
