  The success of the ambitious programs of both long- and short-baseline
neutrino-oscillation experiments employing liquid-argon time-projection
chambers will greatly rely on the precision with which the weak response of the
argon nucleus can be estimated. In the E12-14-012 experiment at Jefferson Lab
Hall A, we have studied the properties of the argon nucleus by scattering a
high-quality electron beam off a high-pressure gaseous argon target. Here, we
present the measured $^{40}$Ar$(e,e^{\prime})$ double differential cross
section at incident electron energy $E=2.222$~GeV and scattering angle $\theta
= 15.541^\circ$. The data cover a broad range of energy transfers, where
quasielastic scattering and delta production are the dominant reaction
mechanisms. The result for argon is compared to our previously reported cross
sections for titanium and carbon, obtained in the same kinematical setup.
