Final answer:
The set containing grams, kilograms, and milligrams represents metric measurements of mass. These units are all part of the metric system and are used to quantify mass.
Step-by-step explanation:
The question asks to identify the set of three units that are all metric measurements of mass. The correct answer is: Grams, kilograms, milligrams. These are all metric units used for measuring mass, with grams being the base unit. A gram is a relatively small unit of mass, while a kilogram is equal to 1,000 grams (103 grams), and a milligram is a smaller unit equal to one-thousandth of a gram (10-3 grams).
In contrast, pounds and ounces are part of the customary or imperial units, which are not metric. Tons can be used in both systems; however, the metric ton (also known as a tonne) is not the same as the short ton used in the United States.
The sets of three units that are all metric measurements of mass are: grams, kilograms, milligrams. These units are part of the metric system and are used to measure the mass of objects.
Therefore answer is b. Grams, kilograms, milligrams.