Question

A light year is a unit of; 1) Velocity; 2) Distance; 3) Time; 4) Energy

Answer 1

1 light year is a unit of distance (in metres)

1 light year = 9.46×10^15 metres....
Hope it helps you

Answer 2

2)distance....

This is you answer mate:-

One light year is the distance travelled by light in one year.