The reaction of $$P_{4}$$ with X leads selectively to $$P_{4}O_{6}$$. The X is

A

Dry $$O_{2}$$

B

A mixture of $$O_{2}$$ and $$N_{2}$$

C

Moist $$O_{2}$$

D

$$O_{2}$$ in the presence of aqueous $$NaOH$$