Final answer:
The number of grams in 500 kg is 500,000.
Step-by-step explanation:
To convert kilograms to grams, you need to multiply the number of kilograms by 1000. In this case, you have 500 kilograms, so you would multiply 500 by 1000 to get the number of grams.
500 kilograms * 1000 = 500,000 grams
Therefore, the correct answer is d. 500,000.