Let's analyze each process in terms of entropy change ( ∆S ): I. Sublimation of dry ice (solid CO2⟶ gas CO2 ) A solid goes directly to a gas. The disorder (randomness) increases significantly. Entropy increases ⟶∆S>0 II. Freezing of water (liquid ⟶ solid) A liquid becomes a more ordered solid structure. Disorder decreases. Entropy decreases ⟶∆S<0 III. Crystallisation of the dissolved substance Dissolved ions/molecules (disordered) form a regular crystal lattice (ordered). Disorder decreases. Entropy decreases ⟶∆S<0 IV. Burning of rocket fuel (combustion) Chemical reaction produces gases and increases randomness overall. Entropy increases ⟶∆S>0 Processes with negative entropy change: II. Freezing of water III. Crystallisation of the dissolved substance Correct answer: Option B - II and III only