Equilibrium: JEE Main 2025 Chemistry question

Consider the following chemical equilibrium of the gas phase reaction at a constant temperature : $\mathrm{A(g) \rightleftharpoons B(g) + C(g)}$ If p being the total pressure, $K_p$ is the pressure equilibrium constant and $\alpha$ is the degree of dissociation, then which of the following is true at equilibrium ?