What does the “visible expression of fear” signify about the cub's experience when confronted with the unknown?

The visible expression of fear in the cub when faced with the unknown is indicative of an instinctual response. This reaction is deeply rooted in the animal’s survival instincts, which are innate behaviors that help organisms respond to potential threats in their environment. Such instinctual responses are not learned through experience but rather are biologically programmed responses that trigger when danger is perceived. In this case, the cub’s fear signals a natural, instinct-driven reaction to an uncertain or potentially harmful situation, aimed at ensuring its safety and survival.

Other options might refer to different aspects of behavior. A proactive nature implies taking initiative, which does not align with a fearful reaction. Learned behavior suggests that the fear is acquired through past experiences rather than being an instinct. A courageous mindset would contradict the state of fear exhibited, as courage involves facing fear rather than displaying it.