Acme Airlines flies airplanes that seat 12 passengers. From experience, they have learned that, on average

Acme Airlines flies airplanes that seat 12 passengers. From experience, they have learned that, on average, 80% of the passengers holding reservations for a particular flight actually show up for the flight. If they book 13 passengers for a flight, what is the probability that 12 or fewer passengers holding reservations will actually show up for the flight? (Write a, b, or c as your answer.)
A. less than 90%
b. between 90 and 95%, inclusive
C. more than 95%