In Regards to Types of Order, Which of the Below

In regards to types of order, which of the below statements is FALSE?

A) The simplest type of order is the market order, an order to be executed at the best price available in the market.
B) The danger of a market order is that an adverse move may take place between the time the investor places the order and the time the order is executed.
C) A buy limit order indicates that the stock may be purchased only at the designated price or lower, while a sell limit order indicates that the stock may be sold at the designated price or higher.
D) The key advantage of a limit order is that there is no guarantee that it will be executed at all; the designated price may simply not be obtainable.