Kinetic energy is the energy associated with the movement of an object. When the skateboarder is at the highest point the type of energy it has is gravitational potential energy which is the energy associated with the height of an object.
When the skateboarder starts to move the gravitational potential energy is converted into kinetic energy. When the skateboarder is at the lowest point the gravitational potential energy is a minimum and the kinetic energy is at a maximum. Therefore, the option with the most kinetic energy is option 1.
