Consider the following schematic plots of orbital wavefunction ( _r...

A radial node is a point where the radial wavefunction $\psi_r$ becomes zero and changes sign, excluding the origin ($r=0$) and infinity ($r \to \infty$).

In a plot of $\psi_r$ versus $r$, the number of radial nodes corresponds to the number of times the curve crosses the horizontal axis ($\psi_r = 0$).

Analyzing the given plots:
Figure A: The curve does not cross the $r$-axis. Number of radial nodes = $0$.
Figure B: The curve crosses the $r$-axis once. Number of radial nodes = $1$.
Figure C: The curve crosses the $r$-axis twice. Number of radial nodes = $2$.
Figure D: The curve crosses the $r$-axis once. Number of radial nodes = $1$.

Therefore, figure C represents an orbital with two radial nodes.

Answer: C