For a reversible process at equilibrium, the entropy change $\Delta S$ is given by

Question

$\begin {array} {1 1} (A)\;\large\frac{\Delta H}{\Delta T} & \quad (B)\;\large\frac{T}{Q_{rev}} \\ (C)\;\large\frac{Q_{rev}}{T} & \quad (D)\;T \Delta H \end {array}$