9. A pencil cost Php8.00 each while a ball pen costs Php 10,00 each Ben has Php63.00. He wants to buy some pencils and ball pens. Which of the of pencils(p) and the number of ball pens (b) that Ben can buy?

a. 8p + 10b > 63
b. 8p + 10b < 63
c. 8p + 10b ≤ 63
d. 8p + 10b ≥ 63​