The Thermal Conductivity of Aluminum Is 238 W / M $\degree$

The thermal conductivity of aluminum is 238 W / m · $\degree$ C and of copper is 397 W / m · $\degree$ C. A rod of each material is used as a heat conductor. If the rods have the same geometry and are used between the same temperature differences for the same time interval, what is the ratio of the heat transferred by the aluminum to the heat transferred by the copper?

A) 0.599
B) 1.67
C) 0.359
D) 2.78