Break 45821 into place values and write each part in words.
• 45 821 = 45 thousands + 821
• 45 thousand = forty-five thousand
• 821 = eight hundred and twenty-one
• Together: forty-five thousand, eight hundred and twenty-one
Eliminate distractors:
• "Four hundred and fifty-eight thousand..." would be 458 000 — too large
• "Forty-five hundred..." would be 4 500 — too small
• "Four hundred and fifty thousand..." would be 450 000 — too large
Final Answer: D: Forty-five thousand, eight hundred and twenty-one