Which of the following is a base unit and its correct symbol in the metric (SI) system?

• A. degree Celsius (°C)
• B. meter (m)
• C. liter (L)
• D. gram (g)

Answer: (B)

Verified step by step guidance

1. Understand that the International System of Units (SI) defines a set of base units from which other units are derived.
2. Recall that base units represent fundamental physical quantities such as length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
3. Identify the base unit for length in the SI system, which is the meter, symbolized as \(m\).
4. Recognize that degree Celsius (°C) is a unit of temperature but not a base unit; the SI base unit for temperature is the kelvin (K).
5. Note that liter (L) and gram (g) are derived or commonly used units but not SI base units; the base unit for mass is the kilogram (kg).