It's the one your body generated. Your body took all its data, generated your mind out of that and experiences your mind. For anything else to happen, you'd have to pipe the signal of your mind (that your body generated) into someone else's brain.
It's like you're asking why is this computer that I generated this data visualization from this data on this computer displaying this data visualization on this computer. Umm, because that's what you asked it to do and that's the default? For anything else to have happened, you would have had to redirect the output to a network and then go receive it on a different computer.
What does it mean for a body to be "mine?" As a materialist, I accept that my body is an assemblage of physical influences. I have no reason to doubt that it has as much self-control as water flowing down a hill. So - does water flowing down a hill have a perspective? Where is it located? It doesn't have a nervous system to blame things on. Is it infinitely divisible? Is it distinct from me? If I pour water from one cup into another, can I say that I'm any less the water as I am my hands, even though I'm controlling the water, getting feedback from the water, subjecting the water as much to my nervous system as I am subjecting my hand itself? What about when I shake your hand? What if I'm blind and I ask you what you can see, then react based on that?
> So - does water flowing down a hill have a perspective? Where is it located?
Why would it? Does it sense and produce a mind? Not that I'm aware of. You could go the pansychism route if you want though. See David Chalmers or something.
> can I say that I'm any less the water as I am my hands, even though I'm controlling the water, getting feedback from the water, subjecting the water as much to my nervous system as I am subjecting my hand itself?
According to enactivism, no. [1] In general, see embodied minds theory. [2]
I'm not intending to. I wasn't proposing all of that as separable questions. I was proposing it as a series of statements that I have no material means to say anything about.
> Why would it? Does it sense and produce a mind?
I don't know what a mind is supposed to be in this context, or its importance. I don't identify my perspective with my thoughts. My thoughts are something a body does. My perspective is just my location. After death, my thoughts will cease. My location will not change.
It's like you're asking why is this computer that I generated this data visualization from this data on this computer displaying this data visualization on this computer. Umm, because that's what you asked it to do and that's the default? For anything else to have happened, you would have had to redirect the output to a network and then go receive it on a different computer.