Commercial Cold Packs Often Contain Solid NH₄NO₃ and a Pouch

Commercial cold packs often contain solid NH₄NO₃ and a pouch of water.The temperature of the pack drops as the NH₄NO₃ dissolves in water.Therefore,for the dissolving of NH₄NO₃ in water,

A) ΔH_soln is negative and ΔS_soln may be negative or positive.
B) ΔH_soln is negative and Δ_Ssoln is positive.
C) ΔH_soln is positive and ΔS_soln may be negative or positive.
D) ΔH_soln is positive and ΔS_soln is positive.