Which of the following units is part of the metric system?

• A. foot
• B. inch
• C. yard
• D. meter

Answer: (D)

Verified step by step guidance

1. Understand that the metric system is an internationally adopted decimal system of measurement based on powers of ten, commonly using units such as meters, liters, and grams.
2. Recognize that units like foot, inch, and yard are part of the Imperial or US customary system, which is different from the metric system.
3. Identify that the meter is the base unit of length in the metric system, defined by the International System of Units (SI).
4. Compare the given options and note that foot, inch, and yard are not metric units, while meter is the standard metric unit for length.
5. Conclude that among the options provided, the meter is the unit that belongs to the metric system.