I guess I dont see how value as a verb implies it must be idiosyncratic (C). Generic valuing of other humans could well be ubiquitously hard wired, as in natural empathy, or drummed into us via religion of other indoctrination.
You could be correct. I'm not saying any of the options must be the case. By idiosyncratic, I just mean how humans are percieved as having value, or being seen as valuable, depends on individual subjects and what they value in others, if at all. In other words, it's a matter of personal taste.
As I stated, the options are possible accounts from me just reflecting on the possibilities. I'm curious of how it might be.
I could be wrong, but I am assuming that lots of people believe others have value, and not always because of a specific religious worldview, like Christianity. Of that group, some will say all humans have value simply because they're human. I tried to capture that group in A. Why do all humans have value, in this case? Maybe there is a property, or conjunction of properties, all humans share that makes them valuable.
Others might say all humans have value because I value myself, they are like me, so they also have value in that they value themselves. I tried to capture that group by B.
Others might hold that some people have value and some don't. That's what I was trying to do with C.
It might be, as has come up in this thread, that human value is assumed on the front end for practical reasons, e.g. the common good or general well-being of a group, or society, or humanity in general.
Then, some might say humans don't have any value. I think that's a hard one for most people because in practice they act as if others are valuable to them (family, friends, employers, whatever).
And why is the notion of human value important? I think most ethics assume humans have value, even if only for pragmatic reasons. I think most people assume humans are valuable and that is why morality matters. But, I would be interested to hear a different perspective.