A market maker quotes the market on an NMS equity security as 39.

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

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

Cis incorrect because $39.10 does not match the ask price.

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