Assertion(A) One atomic mass unit is def...

Assertion(A) One atomic mass unit is defined as one twelth of the mass of one carbon-12 atom.
Reason(R) Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as standard.

Both A and R are true and R is the correct explanation of A.

A is true but R is false.

A is false but R is true

Both A and R are false

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