A rigid rectangular loop of wire with width \(w\), length \(L\), and total resistance \(R\) lies in the \(xy\)-plane and moves in the \(+x\)-direction at a constant speed \(v\). A non-uniform magnetic field directed perpendicular to the \(xy\)-plane and out of the page (in the \(+z\)-direction) has magnitude \(B(x) = \alpha x\), where \(\alpha\) is a positive constant and \(x > 0\). The loop remains completely within the magnetic field at all times. Which of the following correctly pairs the direction of the induced current in the loop with the dependence of the magnitude of the required external pulling force on the loop's position \(x\)?