In which language did Al-Biruni translate the works of Euclid, a Greek mathematician?

Sanskrit

The correct answer is Option (4) → Sanskrit

Al-Biruni’s expertise in several languages allowed him to compare languages and translate texts. He translated several Sanskrit works, including Patanjali’s work on grammar, into Arabic. For his Brahmana friends, he translated the works of Euclid (a Greek mathematician) into Sanskrit.