For what use is a micrometer screw gauge appropriate?
- Ameasuring the current in a coil that is known to be about $3 \times 10^{-6}\,\text{A}$
- Bmeasuring the diameter of a ball bearing that is known to be about $3 \times 10^{-3}\,\text{m}$
- Cmeasuring the mass of a grain of sand that is known to be about $3 \times 10^{-3}\,\text{g}$
- Dmeasuring the moment used to turn a screw that is known to be about $3 \times 10^{-6}\,\text{N m}$