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(C) In the reaction $H_3PO_2 + 4AgNO_3 + 2H_2O \longrightarrow 4Ag + H_3PO_4 + 4HNO_3$:$1$. The oxidation state of $P$ in $H_3PO_2$ is $+1$ and in $H_

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$C$. for either intermolecular redox reaction or displacement reaction.

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(C) In the reaction $H_3PO_2 + 4AgNO_3 + 2H_2O \longrightarrow 4Ag + H_3PO_4 + 4HNO_3$:$1$. The oxidation state of $P$ in $H_3PO_2$ is $+1$ and in $H_3PO_4$ is $+5$. Thus,$P$ is oxidized.$2$. The oxidation state of $Ag$ in $AgNO_3$ is $+1$ and in $Ag$ is $0$. Thus,$Ag$ is reduced.$3$. Since two different elements in different compounds are undergoing oxidation and reduction,this is an intermolecular redox reaction.$4$. Therefore,the correct classification is $C$.

Assign $A, B, C, D$ from the given type of reaction.
$H_3PO_2 + AgNO_3 \longrightarrow Ag + H_3PO_4 + HNO_3$ (Note: The reaction is balanced as $H_3PO_2 + 4AgNO_3 + 2H_2O \longrightarrow 4Ag + H_3PO_4 + 4HNO_3$)

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Assign $A, B, C, D$ from the given type of reaction.$H_3PO_2 + AgNO_3 \longrightarrow Ag + H_3PO_4 + HNO_3$ (Note: The reaction is balanced as $H_3PO_2 + 4AgNO_3 + 2H_2O \longrightarrow 4Ag + H_3PO_4 + 4HNO_3$)