I have this problem in my homework and I can't seem to arrive at the correct answer

In a random sample of 500 college students at WVU, 72% indicated they preferred to study while listening to music or some kind of background noise while others indicated they liked to study in a quiet setting. What is the 99% confidence interval for music/background noise studying?

a. 72 ± 3.44

b. 72 ± 14.14

c. 72 ± .72

d. 72 ± 9.83

e. None of the above

Can anyone teach me how to solve these kinds of questions?