The radial charge density, $R^2\left(r\right){\left(4\pi r^2\right)}^{}$, for a 3s orbital has two radial nodes where the probability is zero. The graph starts at the origin, rises to a maximum, falls to zero (first node), rises to a second smaller maximum, falls to zero again (second node), and then has a final, small rise before decaying asymptotically to zero. The correct graph is the one with two distinct points where the curve touches the x-axis (r).

Final Answer: The third graph.