Read the assertion and reason carfully to mark the correct option in question.
Assertion: Imbibition is a type of diffusion.
Reason: In imbibition, water movement is against concentration gradient.
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.