Acetamide is treated separately with the following reagents. Which would give methyl amine?

Aniline is treated with $NaNO_2 + HCl$ at low temperature to form:

Indicate which nitrogen compound amongst the following would undergo Hofmann's reaction (i.e.,reaction with $Br_2$ and strong $KOH$) to furnish the primary amine $(R-NH_2)$.

Identify '$B$' in the reaction: $\text{Acetamide}$ $\xrightarrow{\Delta, P_2O_5} A$ $\xrightarrow{4H} B$

Consider the above reaction,the compound $A$ is

$Ph-C \equiv N$ $\xrightarrow[{Partial \ hydrolysis}]{H_3O^\oplus} (A)$ $\xrightarrow{Br_2 + KOH} (B)$
Product $(B)$ is