Chemistry · Structure of atom

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Bohr's model is unable to explain the splitting of spectral lines in the presence of a magnetic field (Zeeman effect). Reason (R): Bohr's theory assumes electrons move in well-defined circular orbits of fixed radius and energy. In 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.