Coordination Compounds: JEE Main 2024 Chemistry question

Consider the following test for a group-IV cation. $\mathrm{M}^{2+}+\mathrm{H}_2 \mathrm{S} \rightarrow \mathrm{A} \text { (Black precipitate)+ byproduct }$ $\mathrm{A}+\text { aqua regia } \rightarrow \mathrm{B}+\mathrm{NOCl}+\mathrm{S}+\mathrm{H}_2 \mathrm{O}$ $\mathrm{B}+\mathrm{KNO}_2+\mathrm{CH}_3 \mathrm{COOH} \rightarrow \mathrm{C}+\text { byproduct }$ The spin-only magnetic moment value of the metal complex $\mathrm{C}$ is _________ $\mathrm{BM}$ (Nearest integer)