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B
A rod
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C
Foot of a person
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D
Either of the above
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Solution
The correct option is A
Distance travelled by light in (1/299792458) s
A suitable standard of unit is one which does not change with time or place. Time taken by light to travel 299792458km in vacuum and speed at which light travels for 299792458km in vacuum will be a measure of time and speed respectively. For measuring the length, distance traveled by light in 1299792458 seconds is calculated.
Since, speed of light is constant throughout the universe, calculating distance from this equation will be the most suitable option.