Assertion: In any transition series the magnetic moment of `M^(2+)` ions first decreases
Reason: In a transition series, the number of unpaired electrons first increases and then decreases.

Options

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.

Answer

a