Cells as the basic units of living organisms — practice question

What is the typical length of a prokaryote, for example the bacterium Escherichia coli?

• A$1.5 \times 10^1\ \text{nm}$
• B$1.5 \times 10^2\ \text{nm}$
• C$1.5 \times 10^0\ \mu\text{m}$
• D$1.5 \times 10^1\ \mu\text{m}$