What is the difference between fahrenheit and celsius temperature scales?

Answer : Option A) Potential energy transforming into kinetic energy.

Explanation : When the boulder is rolling down the side of a hill, it shows that when the boulder is at rest at a certain height on the hill, it has potential energy stored in it. When it is rolling down the hill the potential energy gets converted into kinetic energy as it gains velocity while moving down the hill. So, the complete energy transformation that is occurring is potential energy to kinetic energy transfer.