At What Rate Is Thermal Energy Being Generated in the 2R-Resistor

Multiple Choice

At what rate is thermal energy being generated in the 2R-resistor when $\varepsilon$ = 12 V and R = 3.0 $\Omega$ ?

A) 12 W
B) 24 W
C) 6.0 W
D) 3.0 W
E) 1.5 W