Which of the following SI units is used to measure distance in the metric system?

• A. meter
• B. kilogram
• C. liter
• D. second

Answer: (A)

Verified step by step guidance

1. Understand that the metric system uses specific SI units to measure different physical quantities.
2. Recall that distance or length is a measure of how far apart two points are in space.
3. Identify the SI unit for length, which is the 'meter'. It is the base unit for measuring distance in the metric system.
4. Recognize that 'kilogram' is the SI unit for mass, 'liter' is a common unit for volume (not an SI base unit), and 'second' is the SI unit for time.
5. Conclude that among the given options, the correct SI unit used to measure distance is the 'meter'.