The painting is an example of a political work of art.

I would highly suggest False Profits painted by Mear One. I am a huge fan of political art, there is a video on YouTube you can watch where he talks about it while painting it. Or like I said really anything by Banksy or even Shepard Fairey ,Just look up some of their pieces 

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