(A) Saccharin is an artificial sweetner.
(R ) It has a high calorific value.
A. If both (A) and (R ) correct and (R ) is the correct explanation of (A).
B. If both (A) and (R ) 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.