also what is the probability that the bus company's books 21 persons, not enough seats will be available?

A bus company has a policy of booking as many as 21 persons on a bus that can seat only 20. (Past studies have revealed that only 88% of the booked passengers actually arrive for the bus ride.) Find the probability that if the bus company books 21 persons, not enough seats will be available. O A. 0.8800 O B. 0.0683 O C. 0.1955 O D. 0.0631