Which belief is characteristic of rational humanism?

The belief that humans are the highest form of intelligence is indeed characteristic of rational humanism. Rational humanism emphasizes human reason, intelligence, and the capacity for rational thought as foundational elements of understanding the world and improving society. This perspective values human experience and intellect, positing that humans can solve problems and achieve progress through the use of reason and empirical evidence.

In contrast, the other options do not fully align with the central tenets of rational humanism. The idea that science is the key to human development is related but does not encompass the full scope of rational humanism, which prioritizes human intellect and moral agency as central to development. The notion of human nature being fundamentally flawed contradicts the optimistic view of rational humanism that believes in the potential for human improvement and progress. Lastly, the concept of developing intuition, while possibly relevant to some philosophical perspectives, does not typically feature in rational humanism's emphasis on reason and critical thinking as the guiding principles for human understanding and development.