Using the data given below find out the strongest reducing agent.

E° Cr₂O4/Cr³⁺ = 1.33V, E° Cl₂/Cl⁻ = 1.36V, E° MnO₄⁻/Mn²⁺ = 1.51V, E° Cr³⁺/Cr = -0.74V

a. Cr
b. Mn²⁺
c. Cl⁻
d. Cr³⁺