Block A is kept in contact with block B until no further heat flows between them. Block B is then kept in contact with block C until thermal equilibrium is reached. Finally, blocks A and C are brought into contact. What will happen?
a) Heat will flow from C to A because their materials are different, so their temperatures cannot be equal.
b) Heat will flow from A to C because A absorbed heat from the hotter block B and is therefore warmer.
c) No net heat will flow between A and C; they are already at the same temperature.
d) Heat will keep oscillating between A and C indefinitely because their specific heat capacities are unequal.