Chemistry · Some Basic Concepts of Chemistry

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).\n Assertion (A): One atomic mass unit (amu) is defined as a mass exactly equal to one-twelfth the mass of one carbon-12 atom.\n Reason (R): Carbon-12 isotope is selected as the standard for defining atomic masses since 1961. \nIn the light of the above statements, choose the correct answer from the options given below:

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.