Answer: Option (d) is the correct answer.
Step-by-step explanation:
A spontaneous change is defined as the change which occurs on its own and does not require any external force or influence for its occurrence.
A spontaneous change will lead to increase in disorder of the species involved.
As entropy is the degree of randomness present within the molecules of a substance.
Therefore, a spontaneous change will lead to increase in entropy.
Thus, we can conclude that spontaneous changes always increase disorder.