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(C) The standard $emf$ of a cell is given by $E^0_{cell} = E^0_{cathode} - E^0_{anode}$.To maximize $E^0_{cell}$, we must choose the electrode with th

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$C$ is anode and $B$ is cathode

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(C) The standard $emf$ of a cell is given by $E^0_{cell} = E^0_{cathode} - E^0_{anode}$.To maximize $E^0_{cell}$, we must choose the electrode with the highest reduction potential as the cathode and the electrode with the lowest reduction potential as the anode.Given potentials: $E^0_A = +2.5 	ext{ V}$, $E^0_B = +3.0 	ext{ V}$, $E^0_C = -2.0 	ext{ V}$, $E^0_D = -1.5 	ext{ V}$.Highest potential is $E^0_B = +3.0 	ext{ V}$ (Cathode).Lowest potential is $E^0_C = -2.0 	ext{ V}$ (Anode).$E^0_{cell} = E^0_B - E^0_C = 3.0 	ext{ V} - (-2.0 	ext{ V}) = 5.0 	ext{ V}$.Thus, the cell is maximum when $C$ is the anode and $B$ is the cathode.

If the standard reduction potentials of four electrodes $A$, $B$, $C$, and $D$ are $+2.5 \text{ V}$, $+3.0 \text{ V}$, $-2.0 \text{ V}$, and $-1.5 \text{ V}$ respectively, in which of the following cases is the standard $emf$ of the cell maximum?

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