When the forward and reverse paths of a change occur at the same rate,
a. the system is conserved.
b. the system is in equilibrium.
c. the change must be physical.
d. the change must be chemical.

The correct answer is option B. When the forward and reverse paths of a change occur at the same rate, the system is in equilibrium specifically in dynamic equilibrium. Dynamic equilibrium is the balance in a process that is continuing. It is achieved in a reaction when the forward rate of reaction and the backward rate of reaction is at the same value or equal.