Salt dissolves more quickly in water when the water molecules are moving very quickly. in which of these water samples would salt dissolve most slowly?

I believe the answer is A. 15 degrees Celsius.

So, If salt dissolves faster when molecules moves very fast, We add kinetic energy. When we add Kinetic energy to water, we make the water get hotter, which causes the molecules in the water to move faster.

So, if the water is hotter the salt will dissolve faster!

15 degrees Celsius translates to 59 degrees Fahrenheit. Anything number bigger than 15 degrees will dissolve quicker than 15. 98 degrees Celsius is much hotter than 15 degrees Celsius, so I don't understand how anyone would get that answer.