Define the term limiting molar conductivity. How can you determine limiting molar conductivity?

Electrode potential for $\mathrm{Mg}$ electrode varies according to the equation

${\mathrm{E}}_{{\mathrm{Mg}}^{2+}| \mathrm{Mg}}={\mathrm{E}}_{{\mathrm{Mg}}^{2+}| \mathrm{Mg}}^{⊝}-\frac{0.059}{2} \log \frac{1}{\left[{\mathrm{Mg}}^{2+}\right]}.$  The graph of ${\mathrm{E}}_{{\mathrm{Mg}}^{2+}| \mathrm{Mg}} \mathrm{vs} \log \left[{\mathrm{Mg}}^{2+}\right]$ is

The value of ${\mathrm{E}}_{\mathrm{red}}^{\circ }$for metals $\mathrm{A},\mathrm{B} \text{and} \mathrm{C}\text{ is} 0.34 \mathrm{V}, -0.80 \mathrm{V} \text{and} -0.46 \mathrm{V}$, respectively. State the CORRECT order for their ability to act as reducing agent.