Final answer:
Electric charge is quantized, meaning it comes in discrete amounts and must be a whole-number multiple of the charge of one electron.
Step-by-step explanation:
Electric charge is quantized, meaning it comes in discrete amounts. This implies that the charge of an object cannot have just any value, but must be an integer multiple of the charge of one electron (1.602 × 10-19 C). Therefore, option D is the correct answer: the charge of an object is a whole-number multiple of the charge of one electron.