Which of the following measures mass in grams and kilograms?

• A. Metric Units
• B. Imperial Units
• C. Standard Units
• D. Customary Units

Answer: (A)

The correct choice is based on the fact that metric units are the system of measurement used internationally for scientific and most everyday applications. Within the metric system, mass is specifically measured in grams and kilograms, which are standard units for conveying weight. The metric system is decimal-based, allowing for easy conversions and calculations, making it a practical choice for measuring mass in educational contexts.

In contrast, imperial, standard, and customary units pertain to measurement systems that do not typically use grams and kilograms. While imperial units often include pounds and ounces, and customary units may refer to measurements commonly used in the United States (like pounds and feet), neither of these systems utilizes the metric measurements attributed to grams and kilograms. Thus, the specificity of measuring mass in grams and kilograms unequivocally identifies the metric system as the correct answer.