Transition elements in Jee

Chemistry Level pending

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest standard enthalpy change value for M+3|M+2?

Question from JEE 2013 Mains. Posted the question because I don't understand how to get to the answer, so looking for explainations in the solutions.

Cr(Z = 24) Co(Z=27) Fe(Z = 26) Mn(Z = 25)

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