Correct option is A
Given: Length : Metre
Logic: The meter is the unit to measure length.
Let's check the options:
First option: Mass : Gram; The gram is the unit to measure mass.
Second option: Second : Time; The second is the unit to measure time, but the order of words is not the same.
Third option: Gravity : Force; Force is not a unit to measure gravity.
Fourth option: Kelvin : Temperature; The kelvin is the unit to measure temperature, but the order of words is not the same.
So, the correct answer is (a).
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