Spontaneity, Entropy, and Free Energy Question 4

Which of the following equations represents a reaction for which the standard entropy change is positive \((\Delta S^\circ \gt 0)\) ?

\(\ce{3O2(g)->2O3(g)}\)

\(\ce{2H2(g) + O2(g) -> 2H2O(l)}\)

\(\ce{CaCO3(g) -> CaO(s) + CO2(g)}\)

\(\ce{I2(g) + 2K(s) -> 2KI(s)}\)