B ) a distance of earth from the sun at which intensity of light is maximum
C ) the time that earth takes as complete one revolution around the sun
D ) speed of light expressed in miles per day
Explanation:
Light year refers to speed of light expressed in miles per year (it is about ten trillion kilometers or six trillion miles). Light year is a unit of distance. Light Year: the distance that light can travel in one year. The distance light travels in one year is known as the light year. 1 light year is equal to 9.5 x 10^12 km.