Nitrobenzene on reduction by zinc and $NH_4Cl$ gives

The reagent with which the following reaction is best accomplished is:

The major product $A$ is:

In the following reaction,the reason why the meta-nitro product is also formed is:

Aniline reacts with which of these to form a Schiff base?

Given below are two statements:
Statement $I$: Pure Aniline and other arylamines are usually colourless.
Statement $II$: Arylamines get coloured on storage due to atmospheric reduction.
In the light of the above statements,choose the most appropriate answer from the options given below: