Answer:
C
Step-by-step explanation:
The sun's gravity keeps the earth and other nearby celestial objects in orbit. Gravity by an object is directly proportional to its mass. The higher the mass the stronger the gravitational attraction/pull on the nearby revolving planets and celestial bodies.Therefore, when the mass of the sun is reduced, its gravitational pull on the earth (and other planets) reduces making the earth's orbit longer (because it escapes a little further from the pull of the sun).