The diagram illustrates an eyepiece graticule being calibrated with the help of a stage micrometer. Each division on the stage micrometer scale is $0.1\,\text{mm}.$ Which row gives a correct calculation for calibrating each eyepiece graticule unit and includes the correct units?
- A$\frac{0.1}{27} \div 1000$ mm
- B$\frac{0.1}{52} \times 1000$ $\mu \text{m}$
- C$\frac{0.2}{54} \times 1000$ $\mu \text{m}$
- D$\frac{0.2}{79} \times 1\,000\,000$ nm