The correct answer is D) The particles are attracted to each other but are fluid and slide past one another.
The other options of the question are A) The attractions between the particles are stronger. B) The average kinetic energy of the particles decreases. C) The particles form a rigid structure where the atoms vibrate.
The statement that is a result of a substance melting is "the particles are attracted to each other but are fluid and slide past one another."
One example that we can set is ice melting during sunny days. There is less attraction between particles due to the melting.