Answer:
b) Heat
Explanation:
Gas is a state of matter.
Water is the liquid form of H₂O.
Water vapor is the gaseous form of H₂O.
All states of matter occupy volume and have mass.
Heat is the energy when transferred causes a change in a thermodynamic system. The addition of heat causes temperature to increase. The removal of heat leads to the temperature decreasing.
As heat is just energy it has no mass.
