The incorrect statement is D.

• U.S. Treasury bond futures are based on a face value of $100,000, so A is correct.
• The standard S&P 500 futures contract multiplier is $250 times the index level, so B is correct.
• The E-mini NASDAQ-100 futures contract multiplier is $20 times the index level, so C is correct.
• Gold futures are typically 100 troy ounces, not 5,000 troy ounces. The 5,000 troy ounce contract size is associated with silver, not gold.

Correct answer: D