The figure shows a

steady$-$state

microelectrode

voltammogram of a

neurotransmitter

obtained in a solution

of $0\mathrm{.}1MKCl$ at $10$

$m\frac{V}{s}.$ Which best

describes this

voltammogram?

$($A$)$ A scan$-$rate dependent oxidation wave with a

cathodic limiting current of $2\mathrm{.}0nA$ and a standard

oxidation potential of $0\mathrm{.}20V$ vs $A\frac{g}{A}gCl.$

$($B$)$ A scan$-$rate independent reduction wave with a

cathodic limiting current of $2\mathrm{.}0nA$ and a standard

reduction potential of $0\mathrm{.}40V$ vs $A\frac{g}{A}gCl.$

$($C$)$ A scan$-$rate independent oxidation wave with an anodic limiting current of $2\mathrm{.}0$nA and a standard reduction potential of $0\mathrm{.}20$ V vs Ag$/$AgCl$.($D$)$ An irreversible scan$-$rate dependent oxidation wave with an anodic limiting current of $0\mathrm{.}0$nA and unable to obtain its standard reduction potential with the information provided