I'd probably strive away from that since that seems very broad unless you can make it very very specific. 2 and 3 seems doable though. Dont worry about it being philosophical I'm doing my on jurisprudence which is legal philosophy and it's basically an open question but my supervisor hasn't told me doing an open question wasnt okay. I suggest asking your supervisor but I personally like 2
I’d avoid doing the last one, it’s not the most original and will just be compared to the other similar ones. The second one is good. The first one would work too, I like it, you’d just have to make sure you have a clear definition of altruism and narrow it a bit. Just make sure you can actually have decent sources that you can analyse because when it’s not scientific or historical etc, such as philosophy, it is very easy to write 5000 words of junk.