What obstacles do the children encounter while infiltrating the Institute?

The choice of evading detection and deciphering intentions stands out as the correct answer because the core challenge for the children during their infiltration of the Institute involves navigating around the security measures and understanding the motivations and behaviors of those controlling the Institute. The children must use their intellect and teamwork to remain unnoticed, further emphasizing their need to interpret the actions of others and react accordingly.

This is crucial, as the Institute is designed to be a secretive and controlled environment, requiring the children to think critically and adapt to changing circumstances. The need to decipher intentions adds an additional layer of complexity, as understanding the motives behind the security personnel's actions can be the difference between getting caught and successfully completing their mission.

While excessive paperwork, detecting security systems, and finding the entrance might seem like reasonable challenges faced during such an infiltration, they do not encapsulate the essence of the children's primary struggle, which revolves around stealth and perception.