Final answer:
When measuring the weight of a cell phone, grams is the most suitable unit because it provides an easily manageable number for such a light and small object. Kilograms would only be necessary for heavier items, and milligrams are typically used only in scientific contexts for extremely light measurements. Option A is correct.
Step-by-step explanation:
When checking the weight of a cell phone, the most appropriate unit to use would be grams (D). This is because cell phones are relatively light and small, and thus grams provide a small and manageable number to express their weight.
For instance, we typically weigh heavier objects such as people or textbooks in kilograms, as this is a larger unit suitable for more massive items.
However, measuring items like a pencil, paperclip, or cell phone in grams is more practical due to their lighter weight. Similarly, scientists might use milligrams to measure very small quantities, but this unit is not typically used in everyday situations.
It is essential to choose the correct unit of measurement based on the object's size and mass. For a cell phone, using grams allows for consistent and precise measurements compared to using kilograms, which would result in very small, less manageable numbers, or even decagrams which might not be as intuitive.