Step-by-step explanation:
Earth moves in an orbit around the sun. It is due to the gravitational force created due to the mass of the sun that pulls earth towards it. Gravitational force is responsible for the motion of Earth around the sun.
It is similar to the moon orbits earth due to Earth's gravity and as the earth orbits the sun due to the sun's gravity.
Hence, the correct option is (d) " Because the sun's mass creates a gravitational force that pulls Earth towards it".