$3$ moles of ethanol react with $1$ mole of phosphorus tribromide to form $3$ moles of bromoethane and $1$ mole of $X$. Which of the following is $X$?
- A$H_3PO_4$
- B$H_3PO_2$
- C$HPO_3$
- D$H_3PO_3$
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