The length of a year is 365(1/4)days because that is the time it takes
Answer Details
The length of a year is 365(1/4) days because it is the time it takes for the earth to revolve once around the sun. This is called the orbital period of the earth.
The earth takes approximately 365.24 days to complete one orbit around the sun. To account for this fraction of a day, a leap year is added to the calendar every four years, which has an extra day (February 29th) to keep the calendar year synchronized with the earth's orbit around the sun.
Therefore, the correct answer is: "The earth to revolve once round the sun."