Suppose a gaseous mixture of $He$, $Ne$, $Ar$ and $Kr$ is treated with photons of the frequency appropriate to ionize $Ar$. What ion$(s)$ will be present in the mixture?
- A$Ar^{+}$
- B$Ar^{+}, Kr^{+}$
- C$Ar^{+}, He^{+}, Ne^{+}$
- D$He^{+}, Ar^{+}, Kr^{+}$
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