(A) Rate of nitration of benzene and hexadeuterobenzene are different.
(R) C-H bond is stronger than C-D bond.
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is the correct but R is incorect.
D. If both A and R is incorect.
