The correct answer is: C. stop-loss order.
A stop-loss order is an order to sell a security once the price of the security reaches a specified price. This type of order can be used to protect against losses in a volatile market.
A market order is an order to buy or sell a security at the best available price.
This type of order is executed immediately, but it may not be executed at the price you want.A limit order is an order to buy or sell a security
at a specified price or better. This type of order is not executed immediately, but it will be executed if the price of the security reaches your specified price.A contingency order is an order to buy or sell a security based on the occurrence of a certain event. This type of order is not commonly used, but it can be useful in certain situations.
In the case of a very volatile stock, it is important to use an order that will protect you from losses. A stop-loss order is the best option for this purpose.