Aqueous sodium hydroxide reacts with white phosphorous to form phosphine and :

The correct option is A $Na{H}_{2}P{O}_2$
Aqueous sodium hydroxide solution reacts with white phosphorous to form phosphine $\left(P{H}_3\right)$ and sodium hypophosphite $\left(Na{H}_{2}P{O}_2\right)$.

The reaction is as follows:

$P_4+3NaOH+3H_{2}O\to P{H}_3\uparrow +3Na{H}_{2}P{O}_2$