The diagram depicts a pollen grain from a rice plant. The image measures $40\text{ mm}$.\n\nThe real length of the pollen grain is $40\,\mu\text{m}$.\n\nWhat is the magnification of the diagram, in times?
- A$\times 1$
- B$\times 10$
- C$\times 100$
- D$\times 1000$