Which will undergo deprotonation most readily in the basic medium?

Which of the following cannot be explained by crystal field theory?

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 :

Total number of tripeptides possible by mixing of valine and proline is ___________