The correct order of $\mathrm{E}_{\mathrm{SR}^2 / \mathrm{M}}^0$ values with negative sign for the four successive elements $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe}$ and $\mathrm{Co}$ is

• Correct answer
  A

  $\mathrm{Mn}>\mathrm{Cr}>\mathrm{Fe}>\mathrm{Co}$
• B

  $\mathrm{Cr}>\mathrm{Fe}>\mathrm{Mn}>\mathrm{Co}$
• C

  $\mathrm{Fe}>\mathrm{Mn}>\mathrm{Cr}>\mathrm{Co}$
• D

  $\mathrm{Cr}>\mathrm{Mn}>\mathrm{Fe}>\mathrm{Co}$

Hence, the correct answer is option: 'A'.