Answer: Option (a) is the correct answer.
Step-by-step explanation:
When liquid helium is exposed to room temperature then it absorbs energy from the surroundings or atmosphere. As a result, kinetic energy of helium molecules increases and thus, force of attraction between the molecules decrease.
Therefore, liquid helium changes into gas.
Hence, we can conclude that the liquid helium absorbs energy from the air in the room best explains when liquid helium is exposed to room temperature, it forms a gas.