Which one of the following probabilities is a cumula tive probability?()

A. The probability that there are exactly 4 pe ople with Type O+ blood in a sample of 10 peopl e.
B. The probability of exactly 3 heads in 6 flips of a coin.

C. The probability that the accumulated annual Yainfall in a certain city next yeay, younded t o the nearest inch, will be 18 inches.

D.The probability that a randomly selected wo man's height is 67 inches or less.