Which of the following is a unit of volume in the metric system?

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

Answer: (B)

Verified step by step guidance

1. Understand that volume is a measure of the amount of space an object or substance occupies.
2. Recall that the metric system uses specific units for different physical quantities: meters for length, grams for mass, seconds for time, and liters for volume.
3. Identify that 'meter' is a unit of length, 'gram' is a unit of mass, and 'second' is a unit of time, so none of these represent volume.
4. Recognize that 'liter' is the standard metric unit used to measure volume, commonly used for liquids and gases.
5. Conclude that among the given options, 'liter' is the correct unit of volume in the metric system.