two-ten

Which of the following do you think weighs closest to 210 pounds? (no looking anything up and strictly closest, NOT Price is Right rules)

• 1 million average contour feathers~
• 30 bricks~
• 20,000 rubber ducks~
• 85 adult male Mallard ducks~
• A 1993 Toyota Corolla E100 Engine Block~
• 1000 52-card decks of Bicycle playing cards (excluding packaging)~