David's Gasoline Station Offers 4 Cents Off Per Gallon If

Multiple Choice

David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one-hour period,15 customers buy gasoline at this station. What is the probability that all 15 pay in cash?

A) 0.0
B) 0.1
C) 0.9
D) 1.0