Which of the following is an important trait for a security guard?

The answer is strong observational skills and attention to detail because these traits are fundamental to the role of a security guard. Observational skills allow a security guard to notice unusual behavior, identify potential threats, and ensure the safety of the premises. Attention to detail is crucial in recognizing subtle changes in the environment or in people's behavior, which might indicate a security risk. These capabilities help guard against theft, vandalism, and other criminal activities, ensuring that the guard can effectively maintain a safe environment.

In contrast, the other options do not align with the essential responsibilities of a security guard. While independence is important, it should be balanced with the ability to follow guidelines and protocols. Preference for working in isolation can limit communication and coordination with team members or law enforcement, which is often necessary in security situations. Resistance to criticism can hinder personal growth and the ability to adapt to new challenges, both of which are important in the dynamic field of security.