A solid, homogeneous conductor of uniform resistivity \(\rho\) has the shape of a truncated cone of length \(L\). The radius of the circular cross section increases linearly from \(r_0\) at the left end (\(x = 0\)) to \(2r_0\) at the right end (\(x = L\)). A steady direct current \(I\) is maintained through the conductor from left to right. Let \(E_0\) represent the magnitude of the electric field on the central axis at \(x = 0\). Which of the following best describes the graph of the electric field magnitude \(E(x)\) along the central axis as a function of position \(x\) from \(x = 0\) to \(x = L\)?