Iron has a specific heat that is about 3.4 times that of gold. A cube of gold and a cube of iron, both of equal mass and at 20°C, are placed in two different Styrofoam cups, each filled with 100 g of water at 40°C. The Styrofoam cups have negligible heat capacities. After equilibrium has been attained,
(a) The temperature of the gold is lower than that of the iron.
(b) The temperature of the gold is higher than that of the iron.
(c) The temperatures of the water in the two cups are the same.
(d) Either (a) or (b), depending on the mass of the cubes.