Final answer:
The orbital radius of a satellite can be increased by increasing the time it takes to make one revolution around Earth, which decreases the satellite's orbital speed.
Step-by-step explanation:
When considering how the orbital radius of a satellite orbiting Earth can be increased, the correct answer is: d) Increasing the time for the satellite to make one revolution. By increasing the orbital period, the velocity of the satellite in its orbit can be reduced, leading to an increase in the radius of the orbit according to Kepler's third law, which states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. An increase in the orbital radius would also lead to a decrease in the satellite's orbital speed, according to the principle of conservation of mechanical energy, because as the satellite moves to a higher orbit, it gains potential energy and loses kinetic energy.