Which one of the following will give a primary amine on hydrolysis?

Which of the following is the strongest base?

Match the following reactions of benzene diazonium chloride $(ArN_2^{+} Cl^{-})$ given in Column-$I$ with the reagents given in Column-$II$:

Column-$I$	Column-$II$
$(A)$ $ArN_2^{+} Cl^{-} \rightarrow ArOH$	$(p)$ $HBF_4 / NaNO_2, \Delta$
$(B)$ $ArN_2^{+} Cl^{-} \rightarrow ArNO_2$	$(q)$ $H_2 O$
$(C)$ $ArN_2^{+} Cl^{-} \rightarrow ArH$	$(r)$ $HBF_4, \Delta$
$(D)$ $ArN_2^{+} Cl^{-} \rightarrow ArF$	$(s)$ $CH_3CH_2OH$

$A$ solution of methyl amine:

What is the product obtained in the following reaction?

Which of the following is the strongest base in an aqueous medium?