The fact that physiological arousal appears to be universal, but how we interpret which situation should trigger which emotions is not, is best attributed to:

Iwould say d) signed unknown street singers who brought original songs to record.

Trumpets, saxophone, trombone, flute, french horn  mostly in jazz or classic.  you can answer the rest thats on your own honestly 

This sounds like a personal reflection on something you did. it is asking the hardest part, or a part you may have struggled with on an informal interview you must have done. it is also asking advice you'd give someone else for the process of completing an informal interview, so you should write something that would . for example, maybe the first thing they should do, something they should include.