We can see that
when it is extrapolated
The curve is going downward
and it is till it touches temperature axis
so, we can find point there
It intersects at temperature =-280C
Since, it is x-intercept
so, y will be 0 at that point
so, Volume will be 0 when temperature is -280C
and this is absolute zero definition of volume function
so, Absolute zero.........Answer