A triangle can be formed having side lengths 4,5 and 8. It is impossible, however, to construct a triangle with side lengths 4,5 and 9. Ron has eight sticks, each having an integer length. He observes that he cannot form a triangle using any three of these sticks as side lengths. The shortest possible length of the longest of the eight sticks is

**Answer Choices**

A. 20

B. 21

C. 22

D. 23

E. 24