All objects have internal energy. So option a is wrong and does not meet the meaning of the question. Option b is correct and in line with the question.

The "white steam" exhaled in the mouth is composed of small water droplets formed by the liquefaction of water vapor when it is cold. "White steam" is a liquid and water vapor is a gas. So option c is wrong and does not meet the meaning of the question. Option d is correct and meets the meaning of the question.

So choose b and d.