AMC 10A 2002 Problem 2

[system]

For the nonzero numbers a, b, and c, define

(a, b, c)=\dfrac{a}{b}+\dfrac{b}{c}+\dfrac{c}{a}

Find (2,12,9).

Answer Choices
A. 4
B. 5
C. 6
D. 7
E. 8