In which of the following substances does the force of attraction change from the strongest to the weakest on heating?

As camphor is a solid at room temperature, the force of attraction is maximum but when it is heated, it directly gets converted into a gas resulting weak force of attraction. This process of conversion of solids directly into gases is known as sublimation.

Other substances such as ice cream, milk, and honey are not solid so they do not have the maximum force of attraction like camphor. So, the force of attraction does not change from maximum to minimum when they are heated.