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- Total distance earth travel in 1 year ,let say d = 2(pi)r , where r : distance from sun to earth- If the current distance from sun to earth is reduced by 1/4 then new distance = d` = 2(pi)(r/4) = d/4- time = distance/speed. If we make a assumption that speed of earth (revolution) remains constant , then the new time taken is 1/4th of earlier time. ( 1/4 of a year)- So , I conclude option 2 is correct.Note : I`m not a physicist. There is high chance my assumption might be wrong.