Answer:
a) it uses "light-years" to talk about time, but a light-year is a unit of distance.
Step-by-step explanation:
We know that light year is the unit of distance which distance travel by light in a year.The distance of light is travel in a year around 10 trilion kilo meters.
So the our option a is correct which explain our given question.
a)it uses "light-years" to talk about time, but a light-year is a unit of distance.