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The energy-level scheme for the hypothetical one electron element Bansalium is shown in figure. The potential energy is taken to be zero for an electron at an infinite distance from the nucleus.
\( \mathrm{P} \)
\[
\begin{array}{lr}
n=4 \\
n=3 & -2 \mathrm{eV} \\
n=2 & -5 \mathrm{eV} \\
-10 \mathrm{eV}
\end{array}
\]
\[
n=1-20 \mathrm{eV}
\]
W
If a Bansalium atom is in ground state, which of the following photons cannot excite the atom to a higher - state ?
(A) \( 10 \mathrm{eV} \)
(B) \( 15 \mathrm{eV} \)
(C) \( 18 \mathrm{eV} \)
(D) \( 12 \mathrm{eV} \)
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