Final answer:
The appropriate position to hold your rifle while challenging is generally pointed at the ground to ensure safety, although specific contexts may dictate otherwise.
Step-by-step explanation:
The correct position to hold your rifle while challenging is not explicitly specified in the provided references. However, given general safe firearm handling practices, a rifle should never be pointed in an unsafe direction or toward any person when challenging or otherwise. Typically, the correct position would be pointed at the ground (C), ensuring the rifle is aimed in a safe direction where accidental discharge would minimize the risk of injury. It's crucial to follow safety guidelines and the context of the scenario, such as military drill procedures or hunting safety practices, which may dictate the appropriate position to hold your firearm.