Which one of the following is a reason why astronomical distances are measured in light-years?

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Q: (IAS/2021)

Which one of the following is a reason why astronomical distances are measured in light-years?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,105,41,9,5,27,105

keywords: 

{'astronomical distances': [0, 0, 0, 1], 'distances': [0, 1, 1, 2], 'stellar bodies': [0, 0, 0, 1], 'light': [16, 4, 34, 62], 'gravity': [0, 0, 0, 6]}

The reason why astronomical distances are measured in light-years is that "speed of light is always the same". Therefore, the correct option is:

D) Speed of light is always same.

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