Answer:
The correct answer is letter "B": will be cancelled if not immediately executed at the stated price or better.
Explanation:
A fill-or-kill order is placed usually when a large number of shares will be purchased. Traders trigger this type of order to enter a large position at a certain price immediately. If all the shares requested are not filled, the order is automatically canceled. Fill-or-kill orders last as a maximum a couple of seconds not to affect the stock price.