Assertion (A): Ionization enthalpy of Fe²+ is lower than that of Mn²+.
Reason (R): Fe²+ has a 3d⁵ 4s¹ configuration, making the state highly stable.
a) Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.
b) Both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
c) Assertion is true, but the Reason is false.
d) Assertion is false, but the Reason is true.