$1.0\,\text{mol}$ of silver nitrate, $\text{AgNO}_3$, has $1.2 \times 10^{24}$ ions. How many ions are present in $0.25\,\text{mol}$ of iron(III) oxide, $\text{Fe}_2\text{O}_3$?
- A$1.5 \times 10^{23}$
- B$3.0 \times 10^{23}$
- C$7.5 \times 10^{23}$
- D$3.0 \times 10^{24}$