The quote indicates that the market maker is willing to buy 500 shares at $39.05 (bid) and sell 1,000 shares at $39.15 (ask). Market makers are required to honor their quoted size for orders that fall within their bid/ask prices.

D is correct because the market maker is obligated to sell at least 1,000 shares at $39.15 as it falls within the quoted size and price.

B is incorrect because the bid is at $39.05, not $39.00.

C is incorrect because $39.10 does not match the ask price.

A is invalid as a stop order would not activate at $39.00.