In the atmosphere, weather phenomena primarily occur in the troposphere, which is the layer closest to the Earth`s surface. The troposphere extends from the surface up to an average height of about 8 to 15 kilometers (5 to 9 miles).

Option 1, exosphere, is not the correct answer. The exosphere is the outermost layer of the atmosphere and is very thin, consisting mainly of very low-density gases. Weather phenomena do not occur in this layer.

Option 2, stratosphere, is also not the correct answer. The stratosphere lies above the troposphere, extending from about 15 kilometers to 50 kilometers (9 to 31 miles). It contains the ozone layer and the stratopause. While some weather phenomena, like high-altitude clouds or jet streams, can occur in the stratosphere, they are not as prevalent as in the troposphere.

Option 3, ionosphere, is not the correct answer either. The ionosphere is a region within the upper atmosphere, spanning from about 60 kilometers to 1,000 kilometers (37 to 620 miles) above the Earth`s surface. It is responsible for the auroras and plays a role in long-range radio communication, but it is not where most