Answer: Option (b) is the correct answer.
Explanation:
An equilibrium reaction is a reaction in which rate of forward reaction equals to the rate of backward reaction.
Hence, equilibrium reactions are reversible in nature.
For example, [tex]A + B \rightleftharpoons C + D[/tex] is an equilibrium reaction.
Thus, we can conclude that a dynamic state where two opposing forces are in balance, where two opposite events are occurring at equal rates is equilibrium.