(A) `-NO_(2),-CN,-CNO` act as ambident nucleophles.
(R) These consist atoms of same period.
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.