Assertion (A): Water vapour is a lighter gas than air at the same temperature, so humid air will tend to rise by natural convection.
Reason (R): This is a mechanism behind thunderstorms and other weather phenomena.

Options

A. If (A) and (R) are correct and (R) is the correct explanation of (A)
B. If (A) and (R) are correct but (R) is not the correct explanation of (A)
C. If (A) is true but (R) is false
D. If (A) is false but (R) is true

Answer

B