The mass of nickel catalyst recovered after being used in the hydrogenation of an oil is less than mass of nickel added to the reaction .
(R) Catalyst take part in the reaction but are recovered in the end.
A. If both (A) and (R) are true and (R) is the correct explanation of (A).
B. If both (A) and (R) are true but (R) is not the correct explanation of (A).
C. If (A) is correct but (R) is incorrect.
D. If (A) and (R) are both incorrect.
