Two bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ have lost their original labels. They are labeled as $A$ and $B$ for testing. $A$ and $B$ are taken separately in test tubes and boiled with $NaOH$ solution. The final solution of each test tube is acidified with dilute $HNO_3$ and a little $AgNO_3$ is added. Solution $B$ gives a yellow precipitate. Which of the following statements is correct?

• A
  $A$ is $C_6H_5CH_2I$.
• B
  $A$ is $C_6H_5I$.
• C
  $B$ is $C_6H_5I$.
• D
  $HNO_3$ was not required to be added.