Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

1. 

Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
[A]. 4.2 seconds
[B]. 42 seconds
[C]. 4.2 years
[D]. 42 years

Answer: Option C

Explanation:

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