Read the assertion and reason carfully to mark the correct option in question.
Assertion: Diffusion is very important to plants.
Reason: Diffusion is the only means for gaseous movement within the plant body.
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 reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.