Answer
c. 780 marks the approximate birth year of Muhammad ibn Musa al-Khwarizmi, a renowned Persian polymath. His contributions to mathematics, astronomy, and geography were groundbreaking, earning him the title of "Father of Algebra." Al-Khwarizmi's treatise on algebra, "The Compendious Book on Calculation by Completion and Balancing," introduced systematic methods for solving linear and quadratic equations, laying the foundation for the development of modern algebra.