The correct answer is c. mass, height.
If you increase the mass of an object and raise it to a higher height, you will increase its amount of potential energy. Potential energy is directly proportional to both mass and height.
The potential energy of an object in a gravitational field is given by the equation:
Potential Energy = mass * gravitational acceleration * height
By increasing the mass (m) and the height (h), the potential energy (PE) of the object increases:
PE ∝ m * h
Therefore, increasing the mass and height of an object will increase its potential energy.