The eye of a hurricane is surrounded by dense black cumulonimbus clouds which are called the __________.

Correct Answer: Option A — wall cloud

The wall cloud, or eyewall, consists of a dense ring of intense cumulonimbus clouds surrounding the hurricane's eye. This region contains the storm's strongest winds and heaviest precipitation. According to Bowditch, this structure is the most dangerous part of the cyclone, characterized by extreme vertical development and severe turbulence.