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The Lassiagne's extract is boiled with dil $\mathrm{HNO}_3$ before testing for halogens because,

• A
  $\mathrm{AgCN}$ is soluble in $\mathrm{HNO}_3$
• B
  Silver halides are soluble in $\mathrm{HNO}_3$
• C
  $\mathrm{Ag}_2 \mathrm{~S}$ is soluble in $\mathrm{HNO}_3$
• ✓
  $\mathrm{Na}_2 \mathrm{~S}$ and $\mathrm{NaCN}$ are decomposed by $\mathrm{HNO}_3$