Question

a light-year is
○ the distance that light travels in one year.
○ the time it takes a beam of light to go completely around the earth’s orbit.
○ the distance between the sun and the next star
○ the time it takes light to travel between the sun and the furthest planet.
○ the time it takes earth to orbit around the sun

Explanation:

A light - year is a unit of distance in astronomy. By definition, it is the distance that light travels in one year (since light travels at a constant speed, distance = speed×time, and here time is one year). The other options are incorrect: it's not a time to go around Earth's orbit, not the distance between Sun and next star (that varies), not time between Sun and furthest planet, and not Earth's orbital time (that's a year, not light - year).

Answer:

the distance that light travels in one year.