- Meters m are a metric / si unit used for measuring length
- A classroom is usually measured in meter
- Therefore, meter is the si unit that can be used to measure a classroom

So, meter is the si unit that can be used to measure a classroom
Question: Which SI unit would be most appropriate for recording the length of a typical classroom?
Context: - Meters m are a metric / si unit used for measuring length 
- A classroom is usually measured in meter