Answer:
Light year is an appropriate unit to measure large distance across the universe.
Explanation:
Light year is the unit of length. It is used to measure large distances across the universe. It is equal to 9.46 trillion kilometers or 5.88 miles. It is equal to distance travelled by the beam of light in one year.
An astronomical unit, a kilometer and a mile are other units. Astronomical unit is used to measure the distance in solar system.
Hence, the correct option is (c) " A light year ".
