Hi! The correct answer is the third one. I'm not 100% sure, but I hope this helps!
A cantata is a free structure and the oratorio is structured in several acts
I'm unsure what the question here is, but I absolutely agree. You should choose an instrument for you and your own interests. The reality of it is that it's all trial and error. You might try five different instruments and like none of them, or you might try five different instruments and like all of them. Some people just aren't musicians and that's ok. Do what makes you happy.
