In the reverse process of melting, the force of attraction between a substance's molecules select one:
a. increases.
b. decreases.
c. remains the same.
d. decreases and then increases.

A) Increases

Melting is the process of converting a solid into a liquid. When we give heat to a solid substance, its inter molecular forces become weak and the substance starts melting which means it is converted into liquid form. We know that the inter molecular forces between liquid molecules are comparatively weaker than the solid substance. So when the reverse process occurs that is freezing, so a liquid is converted into solid from which means that inter molecular forces will increase to hold the substance in solid form.

c is the correct answer!