Which type of cloud is most likely present on a gray, rainy day? cirrocumulus cirrus cumulus nimbostratus

Option D

Explanation:

Nimbostratus clouds are similar to stratocumulus clouds but are thicker and denser than the stratocumulus clouds thereby producing steady rain or snow. The cloudy layer which is gray in color and associated with the non-stop or continuous rainfall or snowfall is known as Nimbostratus cloud. The precipitation by such clouds in most of the cases ranges between light to moderate.

Nimbostratus clouds produce rain and snow fall. So you would most likely see this cloud on a rainy day.