Acme Airlines flies airplanes that seat 12 passengers. From experience,

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 wil actually show up for the flight? (Write a, b, or c as your answer.)