For which of these scenarios could you use the normal approximation to the binomial?

a. the number of free throws an 80% shooter will make in five attempts.
b. flip a coin 100 times and count the number of heads.
c. the number of bats who carry rabies if the frequency in your population is .8 and you select 4 bats.
d. the number of people who have type o blood if the frequency in your population is .7 and you randomly select 6 people.
e. the number of free throws an 80% shooter will make in six attempts.