Aretha owns shares of Apple that are currently trading at $215 per share. She believes the price could rise or fall in the near future. If the stock continues to rise in value, she would like to maintain her ownership; however, if the stock drops below $205, she would like to sell her shares because she believes that would indicate the start of a downward spiral. She should place a(n):

A) market order.
B) stop-loss order to sell at $205.
C) limit order to buy at $205.
D) all-or-none order.