Final answer:
The base SI unit for speed is meters per second (m/s), which is option 4 in the multiple-choice list provided.
Step-by-step explanation:
The common English unit in which the speed of an automobile is expressed is miles per hour (mi/h or mph). However, the set of base SI units for speed is meters per second (m/s). Therefore, the correct answer to what the set of base SI units for speed is, would be option 4) m/s.
SI units are a system of units used worldwide by scientists and most other professionals. The three base SI units for length, mass, and time are the meter (m), kilogram (kg), and second (s), respectively. By definition, the unit of speed is derived by dividing a distance quantity by a time quantity, thus it is measured in meters per second in the SI system of units.