Which reaction among the following gives nascent oxygen?

Based on the given reaction scheme,identify which of the following statements is $CORRECT$?
$C + A \rightarrow B_2H_6 + B + H_2$
$B_2H_6 + NaH \rightarrow C$
$A + Na_2S_2O_3 \rightarrow B + Na_2S_4O_6$

Assertion: Sulfur is oxidized by $H_2O_2$ in the presence of $Fe(III)$.
Reason: $Fe(III)$ catalyzes the oxidation of sulfur to sulfate.

Which one of the following reactions represents the oxidising property of $H_2O_2$?

$4 \ mL$ of '$X$ volume' $H_2O_2$ on heating gives $80 \ mL$ of oxygen at $STP$. The value of $X$ is:

$KO_2 + H_2O \to KOH + O_2 +$ product $(X)$. Choose the correct statement about product $(X)$.