The correct answer is: E. Nimbostratus
Nimbostratus clouds are low, dark, and thick clouds that often produce continuous rain or snow. They are often associated with fronts and other areas of low pressure.
Stratocumulus clouds are low, puffy clouds that often form in layers. They are usually white or gray, and they can sometimes produce light rain or snow.
Cirrostratus clouds are thin, sheet-like clouds that often cover the entire sky. They are usually white, and they can sometimes produce a halo around the sun or moon.
Cumulonimbus clouds are tall, towering clouds that often produce thunderstorms. They are usually dark, and they can sometimes produce hail and lightning.
Altostratus clouds are mid-level clouds that often form in layers. They are usually gray, and they can sometimes produce light rain or snow.
A dim, “watery” sun visible through a gray sheet-like cloud layer is often a good indication of nimbostratus clouds. This is because nimbostratus clouds are low, dark, and thick clouds that often produce continuous rain or snow. The sun can be seen through the clouds, but it appears dim and watery because the clouds are blocking most of the sunlight.