A cylindrical resistor of length \(L\) and uniform cross-sectional area \(A\) has a position-dependent resistivity given by \(\rho(x) = \rho_0\left(1 + \dfrac{x}{L}\right)\) for \(0 \le x \le L\), where \(\rho_0\) is a positive constant. It is connected in series at \(x = L\) to a second cylindrical resistor of the same cross-sectional area \(A\), length \(L\), and uniform resistivity \(2\rho_0\) occupying the interval \(L \le x \le 2L\). A steady current \(I\) flows through the combination in the \(+x\)-direction, and the end at \(x = 2L\) is connected to an electrical ground such that \(V(2L) = 0\text{ V}\).

Which of the following best describes the graph of the electric potential \(V(x)\) as a function of position \(x\) for \(0 \le x \le 2L\)?