The correct statement about the development of Newton's theory of universal gravitation is:
Isaac Newton described the existence of gravitational force mathematically, but he built upon the ideas of other scientists before him.
Newton's theory of universal gravitation was influenced by the work of earlier scientists, including Johannes Kepler, who formulated laws of planetary motion, and Robert Hooke, among others. Newton's ability to mathematically express the gravitational force was a significant development in our understanding of gravity.