In this europium sample, the only isotopes that occur naturally are $^{151}\text{Eu}$ and $^{153}\text{Eu}$. The relative atomic mass, $A_r$, of the sample is $152$. Determine the percentage of $^{151}\text{Eu}$ in the sample, giving your answer to three significant figures.
- A0.987%
- B50.0%
- C76.0%
- D98.7%