The electron micrograph shows a chloroplast. The length of the chloroplast on the line indicated is $80\,\text{mm}$. The actual length of the chloroplast is $10\,\mu\text{m}$. Calculate the magnification of the chloroplast.
- A$8 \times 10^2$
- B$8 \times 10^3$
- C$8 \times 10^4$
- D$8 \times 10^6$