Assertion: The flash of lightening is sees before the sound of thunder is heard.
Reason: Speed of sound is greater than speed of light.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false