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(B) The reducing power of a metal is inversely proportional to its standard reduction potential $(E^{\circ}_{red})$.Lower (more negative) $E^{\circ}_{

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$B < D < C < A$

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(B) The reducing power of a metal is inversely proportional to its standard reduction potential $(E^{\circ}_{red})$.Lower (more negative) $E^{\circ}_{red}$ values indicate a stronger reducing agent.Given values:$E^{\circ}(A^{+}/A) = -2.93 \ V$$E^{\circ}(C^{2+}/C) = -2.37 \ V$$E^{\circ}(D^{3+}/D) = -0.74 \ V$$E^{\circ}(B^{+}/B) = 0.80 \ V$Comparing the values: $-2.93 The reducing power order is the reverse of the reduction potential order: $B < D < C < A$.

Standard electrode potentials are given:
$A^{+}/A = -2.93 \ V$ $B^{+}/B = 0.80 \ V$
$C^{2+}/C = -2.37 \ V$ $D^{3+}/D = -0.74 \ V$
Increasing order of reducing power of these metals:

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Standard electrode potentials are given:$A^{+}/A = -2.93 \ V$ $B^{+}/B = 0.80 \ V$$C^{2+}/C = -2.37 \ V$ $D^{3+}/D = -0.74 \ V$Increasing order of reducing power of these metals: