Which of the following variables would be expected to follow the binomial distribution?

Select one:

a.The age of students in a class, if the mean age is 19 years, 6 months.

b.The time it takes students to finish an exam, if the mean time to finish is 45 minutes.

c.The number of cars that pass through an intersection each hour.

d.The number of grades of A in a class, if the probability that any student gets an A is .2.