Correct Answer:
C. 1000
This question tests basic knowledge of the metric system and unit conversions. The prefix 'kilo-' in 'kilometer' is a standard multiplier in the International System of Units (SI). 'Kilo' universally means one thousand (1000).
Therefore, one kilometer is equivalent to 1000 meters. This fundamental conversion is crucial for understanding distances in many scientific and everyday contexts. Option C is the correct answer.
- A: 10 meters is incorrect; this would be a decameter.
- B: 100 meters is incorrect; this would be a hectometer.
- D: 10000 meters is incorrect; this is ten kilometers, not one. Misunderstanding the 'kilo' prefix is a common source of error for these distractors.