Cells as the basic units of living organisms — practice question

What is the diameter of a typical prokaryote, for example Streptococcus?

• A$7.5 \times 10^1\,\text{nm}$
• B$7.5 \times 10^2\,\text{nm}$
• C$7.5 \times 10^0\,\mu\text{m}$
• D$7.5 \times 10^1\,\mu\text{m}$