Find the Mass of the Triangular Lamina with Vertices $( 0,0 ) , ( 18,36 ) \text {, and } ( 36,0 ) \text { for }$

Multiple Choice

Find the mass of the triangular lamina with vertices $( 0,0 ) , ( 18,36 ) \text {, and } ( 36,0 ) \text { for }$ the density $\rho=k x y$

A) $139,968 k$
B) $279,946 k$
C) $39,958 k$
D) $139,973 k$
E) $279,936 k$