A sample of substance X is made up of iron and sulfur only. $[A_r: \text{Fe},\,56;\,\text{S},\,32]$ In which row could both statements about X be correct?
- AStatement 1: X is a mixture with the ratio $4:7$ by mass of iron and sulfur. Statement 2: X is a compound with the ratio $4:7$ by mass of iron and sulfur.
- BStatement 1: X is a mixture with the ratio $7:4$ by mass of iron and sulfur. Statement 2: X is a compound with the ratio $7:4$ by mass of iron and sulfur.
- CStatement 1: X is a mixture with the formula $\text{FeS}$. Statement 2: X is a compound with the formula $\text{FeS}$.
- DStatement 1: X is a mixture with the formula $\text{FeSO}_4$. Statement 2: X is a compound with the formula $\text{FeSO}_4$.