The correct answer is: D. 1 year.
The total mass of water vapor stored in the atmosphere at any moment is about 1 year’s worth of precipitation. This means that if all of the water vapor in the atmosphere were to precipitate out, it would take about 1 year for the Earth’s surface to be covered in water.
The other options are incorrect because they are much shorter periods of time than 1 year. For example, 1 day’s worth of precipitation is only about 0.001% of the total mass of water vapor in the atmosphere.
It is important to note that the amount of water vapor in the atmosphere varies depending on the time of year and the location. For example, the atmosphere contains more water vapor in the tropics than in the polar regions. The amount of water vapor in the atmosphere also varies depending on the weather. For example, there is more water vapor in the atmosphere on a humid day than on a dry day.