When can the United States flag be displayed at night?

The United States flag can be displayed at night when it is well illuminated, which is the key detail that supports this answer. The Flag Code states that the flag should be displayed only during daylight hours unless it is properly illuminated. This means that if the flag is illuminated sufficiently by artificial light, it may be displayed at night, ensuring that it is visible and remains respectful to its status as a national symbol. Proper illumination shows care and respect for the flag, allowing it to be honored even after sunset.

Other options frame the display of the flag in a limited manner, either suggesting it can only be shown during specific occasions or by certain individuals, which does not align with the regulations dictating respectful treatment of the flag.