Assertion `(A)`: The process of adsorption of hydrogen on palladium is known as occlusion.
Reason `(R)` : The adsorbed hydrogen is more active than ordinary hydrogen.
A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If (A) is incorrect, but (R) is correct.