The diagram depicts a stage micrometer scale seen through an eyepiece graticule at a magnification of $\times 200$. At this same magnification, a chloroplast measures $4$ eyepiece graticule divisions in length. What is the length of the chloroplast?
- A$1.0 \times 10^{1}\,\mu\text{m}$
- B$4.0 \times 10^{2}\,\mu\text{m}$
- C$2.5 \times 10^{-1}\,\mu\text{m}$
- D$2.5 \times 10^{-2}\,\mu\text{m}$