Final answer:
A hurricane is defined as a large area of sustained winds greater than 74 miles per hour. When winds reach a sustained speed of 74 miles per hour, a storm is classified as a hurricane. At this wind speed, the center of the storm develops a calm area known as the eye.
Step-by-step explanation:
A hurricane is defined as a large area of sustained winds greater than 74 miles per hour. When winds reach a sustained speed of 74 miles per hour, a storm is classified as a hurricane. At this wind speed, the center of the storm develops a calm area known as the eye. So, the correct answer is D. the center of the storm develops a calm area known as the eye.