Read the text and choose the best answer.
Al Khorazmiy was a great Uzbek scientist who was born in 783 in Khorazm. His full name was Abu Abdullah Muhammad ibn Muso. He did his researches in mathematics, astronomy and geography. He enriched the world’s science with his scientific achievements. He wrote more than 20 works and some of them were translated into many languages of the world. The widely used term “algoritm” is the changed version of Al Khorazmiy’s name and the word “algebra” is the changed version of his famous book on mathematics “Aljabr”. Al Khorazmiy’s contribution into the worlds science is …

a) his famous book “Aljabr” on astronomy.
b) his translations into many languages of the world
c) his scientific achievements in mathematics, astronomy, geography
d) his famous many books on geography.