You have a nickel, a dime, a quarter and a half

Question

dollar. A clerk shows you several items, each a
different price, any one of which you could buy with
your coins without receiving change. What is the
largest number of articles he could have shown you?

a. 8
b. 10
c. 13
d. 15
e. 21

please answer and explain

Answer 1

21

Answer 2

21