Which of the following is the SI base unit for length?

• A. meter (m)
• B. kilometer (km)
• C. centimeter (cm)
• D. inch (in)

Answer: (A)

Verified step by step guidance

1. Understand that the International System of Units (SI) defines a set of base units for fundamental physical quantities.
2. Recall that length is one of the fundamental physical quantities measured in the SI system.
3. Identify the SI base unit for length, which is the unit defined by the SI system without any prefixes or modifications.
4. Recognize that the meter (m) is the SI base unit for length, while kilometer (km) and centimeter (cm) are derived units with prefixes, and inch (in) is a non-SI unit.
5. Conclude that among the options given, the meter (m) is the correct SI base unit for length.