If the Earth were to go around the Sun on a circular path instead of an elliptical one, it would result in option 2, the difference between seasons being reduced.

The Earth`s orbit around the Sun is elliptical, meaning it is not a perfect circle. This elliptical shape causes the distance between the Earth and the Sun to vary throughout the year. When the Earth is closer to the Sun, it experiences summer in the respective hemisphere, and when it is farther away, it experiences winter.

If the Earth were to follow a circular path, the distance between the Earth and the Sun would remain constant throughout the year. As a result, the difference in distance and the amount of sunlight received by the Earth would be minimized. This would lead to a reduction in the temperature extremes between seasons.

Option 1 is incorrect because changing the shape of the Earth`s path around the Sun does make a difference. Option 3 is incorrect because the circular path would not necessarily cause the Earth to become hotter. Option 4 is incorrect because the circular path does not necessarily make the Earth colder.