Correct Answer: Human capital

Solution : While all forms of capital, including financial capital, physical capital, and natural capital, are important for economic growth, human capital is often considered the most critical factor. Human capital encompasses the knowledge, skills, education, and health of individuals, which directly contribute to their productivity and ability to innovate. A skilled and educated workforce can drive technological advancements, improve productivity, and foster innovation, leading to sustained economic growth over the long term. Investments in human capital, such as education, training, and healthcare, are vital for enhancing the capabilities of individuals and promoting economic development.