Light year is a measure of

Correct option is B

A light-year is a measure of distance

Explanation:
● A light-year refers to the distance that light travels in one year in a vacuum, approximately 9.46 trillion kilometers (5.88 trillion miles).
● It is used in astronomy to measure vast distances between celestial objects like stars and galaxies.
● The term helps convey the immense scale of the universe in a comprehensible manner.

Information Booster:
● Light travels at a speed of 299,792 kilometers per second in a vacuum.
● Proxima Centauri, the nearest star to Earth after the Sun, is about 4.24 light-years away.
● The concept of light-years helps scientists calculate the age and expansion of the universe.