Option d is the correct answer. Bhaskaracharya, also known as Bhaskara II, was a 12thcentury mathematician and astronomer who wrote several works on mathematics and astronomy, such as the Siddhantasiromani and the Lilavati. Lilavati is a Sanskritlanguage work on mathematics that covers various topics such as arithmetic, algebra, geometry, trigonometry, and mensuration. The work is named after Bhaskaracharya's daughter Lilavati, who was also interested in mathematics. The work contains many problems and solutions on various mathematical topics, such as fractions, decimals, ratios, proportions, permutations, combinations, progressions, equations, etc.