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(C) radial node is a region where the probability of finding an electron is zero, which corresponds to the points where the radial wavefunction $\psi(

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$C$

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(C) radial node is a region where the probability of finding an electron is zero, which corresponds to the points where the radial wavefunction $\psi(r)$ crosses the $r$-axis (i.e., $\psi(r) = 0$).$1$. In plot $A$, the wavefunction $\psi$ does not cross the $r$-axis, so there are $0$ radial nodes.$2$. In plot $B$, the wavefunction $\psi$ crosses the $r$-axis once, so there is $1$ radial node.$3$. In plot $C$, the wavefunction $\psi$ crosses the $r$-axis twice, so there are $2$ radial nodes.$4$. In plot $D$, the wavefunction $\psi$ crosses the $r$-axis once, and it starts from zero at $r=0$, which is characteristic of orbitals with $l > 0$ (like $p$ or $d$ orbitals).Thus, the figure representing two radial nodes is $C$.

Consider the following schematic plots of radial orbital wavefunction $(\psi)$ against distance $(r)$ from the nucleus. The figure representing an orbital with two radial nodes is

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