Which statement correctly describes Raoult's law for an ideal solution of two volatile liquids A and B?

Raoult's law for component $A$: $p_A = p_A^* \chi_A$, where $p_A^*$ is the vapour pressure of pure $A$ and $\chi_A$ is its mole fraction in the liquid. The same form applies to $B$. Total vapour pressure: $p = p_A^* \chi_A + p_B^* \chi_B$. The key word is **proportional**, with proportionality constant equal to the pure-component pressure. Option A would only hold at $\chi = 1$ (pure component).