The thickness of a cell membrane is typically around 7.5 to 10 nanometers (nm), which is equivalent to 0.0075 to 0.010 micrometers (μm). To address your options in the context of nanometers:
- A. 70-100 nm
- B. 100-150 nm
- C. 30-60 nm
- D. 10-20 nm
The most accurate option is D. 10-20 nm, as it encompasses the typical thickness of a cell membrane.