The length of the square is same as the diameter of the circle which is inscribed in it.

It is clear from the figure that the sum of $$x$$ and $$y$$ is less than the diameter of the circle, so is less than the length of the side of the square. So, we get $$x+y<10$$ i.e. $$\frac{x+y}{2}<\frac{10}{2}=5$$

Hence column $$B$$ has higher quantity when compared with column $$A$$, so the answer is (B).