Troposphere
The correct answer is option 'A', which is the Troposphere.

Weather Phenomena in the Troposphere
The troposphere is the lowest layer of the Earth's atmosphere, extending from the Earth's surface up to an average height of about 7-20 kilometers (4-12 miles). It is the layer in which weather phenomena occur. Here is a detailed explanation of the weather phenomena that occur in the troposphere:

1. Rainfall
Rainfall is a common weather phenomenon that occurs in the troposphere. It is the result of the condensation of water vapor in the air, which forms clouds. When the water droplets in the clouds become too large to be suspended in the air, they fall to the ground as precipitation, which can be in the form of rain, snow, sleet, or hail.

2. Fog
Fog is another weather phenomenon that occurs in the troposphere. It is a cloud that forms near the ground when the air is cooled to its dew point, causing the water vapor in the air to condense into water droplets. Fog reduces visibility and can be formed by various processes such as radiation fog, advection fog, and upslope fog.

3. Hailstorm
Hailstorms are severe weather events that can occur in the troposphere. They are characterized by the formation of large hailstones, which are balls of ice that can range in size from small pebbles to golf balls or even larger. Hailstones are formed when updrafts in thunderstorms carry raindrops upward into extremely cold areas of the atmosphere, where they freeze and accumulate layers of ice. Eventually, the hailstones become too heavy for the updrafts to support and fall to the ground during a hailstorm.

Conclusion
In conclusion, weather phenomena such as rainfall, fog, and hailstorms occur in the troposphere, which is the lowest layer of the Earth's atmosphere. The troposphere is where most of the Earth's weather takes place, and it extends from the Earth's surface up to an average height of about 7-20 kilometers. Understanding the characteristics and processes of the troposphere is crucial for studying and predicting weather patterns.

Yes its correct in geography book it is also written in ch3 air