A student looked at a slide of human blood using a light microscope and produced a precise drawing of the various cell types. An eyepiece graticule was used so that the relative dimensions of the different cell types were recorded accurately. In the drawing: - red blood cells measured $7\,\text{mm}$ in diameter - lymphocytes measured $6\,\text{mm}$ in diameter - neutrophils measured $14\,\text{mm}$ in diameter. What is the linear magnification of the drawing?
- A$\times 10$
- B$\times 40$
- C$\times 100$
- D$\times 1000$