The most appropriate unit to use is option (c) meters
Measuring Unit
A measuring unit is a standard quantity used to express a physical quantity.
Why other options are in correct?
- The redwood tree measured is 100 unit tall so if the unit will be millimeters and centimeters it will so small as it is mention that it is very large
- If the the unit is kilometers it will be so large that the any tree cannot be exist
So the appropriate unit to measure large redwood tree which is 100 unit will be meters
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