Use Definite Integrals to Find the Centroid of the Region $f ( x ) = 3 x$

Multiple Choice

Use definite integrals to find the centroid of the region between the graphs of $f ( x ) = 3 x$ and the x-axis on the interval [0, 3].

A) (2, 4)
B) (1.5, 3)
C) (2, 3)
D) (0, 3)