An Assertion and a Reason are given below
Assertion: When a velocity is kept constant and wavelength is halved, then the frequency is doubled
Reason: Velocity = Frequency × Wavelength
Choose the answer:

A. Both assertion and reason are true and reason is the correct explanation of assertion

B. Both assertion & reason are true but reason is not the correct explanation of assertion

C. Both assertion and reason are false

D. Assertion is true but the reason is false

Answer: Option A