The correct answer is option 4, Cumulonimbus. Cumulonimbus clouds are known for their vertical extent, reaching high altitudes. These clouds are typically associated with strong convectional currents and can extend from the low levels of the atmosphere all the way up to the tropopause, which is the boundary between the troposphere and the stratosphere.

Cumulonimbus clouds are responsible for producing convectional rain, which occurs when warm air rises rapidly and forms clouds. As the warm air rises, it cools and condenses, forming cumulonimbus clouds. These clouds are often characterized by their thunderstorm activity, with lightning and thunder occurring as a result of the strong updrafts and downdrafts within the cloud.

Altocumulus, option 1, and cirrocumulus, option 2, are mid-level clouds that do not have the same vertical extent as cumulonimbus clouds. They are generally associated with fair weather or indicate the approach of a weather front.

Cirrostratus, option 3, is a high-level cloud that forms a thin, sheet-like layer. While it may produce precipitation, it is typically in the form of light rain or drizzle rather than the intense con