An RC circuit consisting of a resistor of resistance \(R\) and an uncharged capacitor of capacitance \(C\) connected in series is driven by a variable voltage source producing a ramp voltage \(V(t) = \alpha t\), where \(\alpha\) is a positive constant and \(t \ge 0\). Which of the following expressions represents the charge \(q(t)\) on the capacitor as a function of time?