What is the best reagent to convert nitrile to primary amine?

An organic compound $A$ upon reacting with $NH_3$ gives $B$. On heating $B$ gives $C$. $C$ in presence of $KOH$ reacts with $Br_2$ to give $CH_3CH_2NH_2$. $A$ is:

What is obtained by the reduction of acetaldoxime?

What will be the major product in the given reaction?

Aniline is not the major product in one of the following reactions. Identify that reaction.

Which of the following gives a primary amine on reduction?