According to the 11th General Order, what must a sentry do during the time for challenging?

The correct response emphasizes the critical duty of a sentry to challenge all individuals approaching their post. This action serves several important functions: it ensures security by identifying those who are authorized to be in the vicinity, it maintains accountability for everyone who crosses the sentry's line of duty, and it helps prevent unauthorized access, thereby safeguarding sensitive areas or information.

Challenging is a fundamental aspect of the sentry's role, aligning with the overarching principle of vigilance in duty. By actively questioning individuals on or near their post, the sentry can assess intentions and build a secure environment. This proactive approach is essential in military and security operations, reflecting the necessity of awareness and responsibility.

The other options presented do not address the primary function of a sentry during the challenging period. Allowing everyone to pass undermines the security protocol, while returning to the guardhouse or simply reporting suspicious activity lacks the proactive engagement necessary for effective sentry duty.