An organic compound $A$ contains nitrogen and chlorine. It dissolves readily in water to give a solution that turns litmus red. Titration of compound $A$ with standard base indicates that the molecular weight of $A$ is $131 \pm 2$. When a sample of $A$ is treated with aqueous $NaOH$,a liquid separates which contains $N$ but not $Cl$. Treatment of the obtained liquid with nitrous acid followed by phenol gives an orange precipitate. The compound $A$ is:

• A
  $C_6H_5NH_3Cl$
• B
  $C_6H_5CH_2NH_2 \cdot HCl$
• C
  $o-Cl-C_6H_4NH_2$
• D
  $p-Cl-C_6H_4NH_3Cl$