The diagram illustrates an epidermal cell from an onion plant. On the diagram, the distance from X to Y is $60\,\text{mm}$. In reality, the cell length between X and Y is $150\,\mu\text{m}$. Calculate the magnification of the cell.
- A$\times 40$
- B$\times 250$
- C$\times 400$
- D$\times 2500$