Assertion: The brilliance of a diamond is due to total internal reflection.
Reason: The critical angle of diamond is 24°.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Both assertion and reason are false.