Which cloud type typically produces steady rain over a wide area?

Nimbostratus clouds are the correct choice because they are characterized by their thick, uniform layer that covers a significant area, leading to consistent and steady rainfall. These clouds often appear dark and dense, typically found in stable atmospheres where there is extensive lifting of air. The continuous nature of the precipitation associated with nimbostratus clouds can cover large regions for extended periods, making them responsible for steady, uniform rain.

In contrast, cumulus clouds are generally associated with fair weather and may produce brief, localized showers rather than steady rain. Stratus clouds also bring light precipitation but are more associated with overcast skies without the consistent rain over a wide area that nimbostratus clouds provide. Cumulonimbus clouds, while they can produce heavy precipitation, are often linked to thunderstorms and more severe weather conditions, leading to variable rain rather than the steadiness characteristic of nimbostratus. Thus, nimbostratus is the definitive cloud type for widespread, steady rain.