Water vapor helps keep the earth's heat from escaping into space.
Explanation:
Of all the options only the first option is correct. Yes, the water vapor helps keep the Earth's heat from escaping into the space. Water vapor is green house gas meaning it has the ability to absorb heating coming from the sun. Among the rest options sublimation is process of conversion of solid directly into the gas. Most of the water vapor in the air does not come from the transpiration and evaporation from the oceans add salt water to the atmosphere is absolutely wrong.
