Final Answer:
The metric unit of volume is b. mL (milliliter). This unit is commonly used for measuring the volume of liquids and is equivalent to one cubic centimeter (1 cm³).
Step-by-step explanation:
Volume is a measure of the amount of space occupied by an object, and the metric system provides standardized units for this measurement. In the metric system, milliliters (mL) are used as the unit for volume. One milliliter is equivalent to one cubic centimeter (1 cm³).
This relationship is derived from the fact that 1 cm is equivalent to 1 mL. The volume of a cube with sides of length 1 centimeter is 1 cubic centimeter, and this volume is also represented by 1 milliliter. Therefore, b. mL is the correct metric unit of volume among the options provided.
It's important to note that options a. Ounce and c. mg do not represent metric units of volume. An ounce is a unit of mass commonly used in the imperial system, and milligrams (mg) are units of mass in the metric system. These units measure the amount of matter in an object, not the space it occupies. In contrast, milliliters specifically quantify the volume of a substance, making it the appropriate metric unit for this purpose.