A cashier gives one person a $5 bill and 15 $1 bills in exchange for a $20 bill. he gives a second person a $10 bill, a $5 bill, and five $1 bills in exchange for a $20 bill. Which characteristics of money does this illustrate?

a. Durability.
b. Portability.
c. Divisibility.
d. Uniformity.

c. Divisibility.

This scenario demonstrates the characteristics of money being divisible into smaller denominations to make change for larger bills.