The picture depicts a pollen grain from a grass plant. Its length in the picture is $60\,\text{mm}$. The real length of the pollen grain is $500\,\mu\text{m}$. Calculate the magnification of the pollen grain?
- A$\times 0.12$
- B$\times 30$
- C$\times 120$
- D$\times 30\,000$