The correct answer is C: Call the net to order and direct communications between stations checking in. The Net Control Station (NCS) is responsible for calling the net to order (starting the net session) and directing communications between stations that check in. The NCS manages the net's operation and ensures orderly communication. While the NCS may be involved in choosing frequencies and times, and may verify licenses, their primary duty is to call the net and direct traffic. The NCS acts as a coordinator, ensuring that stations check in properly, that messages are handled correctly, and that the net operates smoothly. This is the core function of net control.