The correct answer is: B. oceans
Explanation:
1. Most of the water vapor in the atmosphere originates from the oceans through the process of evaporation.
2. Evaporation occurs when the sun's heat causes water from the oceans to turn into water vapor, which then rises into the atmosphere.
3. This water vapor eventually condenses to form clouds and precipitation, completing the water cycle.
4. While plants release water vapor through transpiration, the primary source of water vapor in the atmosphere is the oceans due to their vast surface area.
