Assertion : To hear distinct beats, difference in frequencies of two sources should be less than `10`.
Reason : More the number of beats per sec more difficult to hear them.
A. If both assertion and reason are true and reason is the correct expleanation of assertion.
B. If both assertion and reason are true and reason is not the correct expleanation of assertion.
C. If assertion is true but reason is false.
D. If assertion and reason both are false.