(iii) is correct.
Explanation: A light year is the distance traversed by light in one year. So it is given by
Speed of light × No. of seconds in a year=
365.25 x 24 x 60 x 60 x 3 x 108 m
The no. of seconds in a year is given by the no. of days in a year ×no. of hours in a day × no. of minutes in an hour× no. of seconds in a minute.
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