Which of the following will form acidic oxide?

Phosphorus (P) will form acidic oxide.
When non-metals and oxygen combine, they produce acidic oxide compounds that are bound together by covalent bonds. These substances may also be referred to as acid anhydrides. Only phosphorus (P), out of the elements listed, is non-metal. As a result, acidic oxide will be formed. The reaction can be written as follows:
P₄ (s)+5O₂ (g)⟶2P₂O₅ (s)