Identify the reaction from having top position in EMF series according to their electrode potential at 298k
A. Mg²⁺+2e⁻→Mg(s)​
B. Fe²⁺+2e⁻→Fe(s)​
C. Au³⁺+3e⁻→Au(s)​
D. K⁺+le⁻→K(s)​