The element oxygen exists as three stable isotopes, $^{16}\text{O}$, $^{17}\text{O}$ and $^{18}\text{O}$. A mass spectrometer was used to examine a sample of oxygen gas, $\text{O}_2$, and each of these isotopes is found in the sample. How many peaks would be expected to be linked with the $\text{O}_2^+$ ion?
- A3
- B5
- C6
- D9