Final answer:
A buy stop order at 39 could be filled at the stop price of 39 or any higher price such as 40 or 41, with prices above 39 being more likely once the order converts to a market order.
Step-by-step explanation:
A buy stop order is an order to purchase a security when its price climbs to a specific level, above the current market price. Once the stop price is reached, the order becomes a market order and is filled at the best available price. Therefore, a buy stop order placed at 39 could not be filled at a lower price, such as 38, but can be filled at the stop price or any price higher, as the market dictates. So the correct answer is that a buy stop order at 39 could fill at: B.39, C.40, or D.41, with C.40 and D.41 being more likely as the order turns into a market order and will take the next available price, which could be higher if the stock is moving up quickly.