Two statements are given below. One is labelled Assertion (A) and the other is labelled Reason (R). Read the statements carefully and choose the option that correctly describes statements A and R.
Assertion (A) : The mass of a nucleus is less than the mass of the constituent particles.
Reason (R) : Energy is absorbed when the nucleons are bound together to form the nucleus.
A. Both assertion and reason are true and reason is the correct explanation for assertion.
B. Both assertion and reason are true but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Both assertion and reason are false.