Mr Jacques wrote a bonus problem on the board. I f Gina correctly answer, she gets extra time to read. The problem is to write a statement that correctly relates the numbers 9 and 18. Which should Gina write?

A18 is a common multiple of 9

and 18

B27 is a common multiple of 9 and 18
C9 is a multiple of 18

d)18 is a factor of 9