Modern orangutans most likely evolved from a. Dryopithecus. b. Sivapithecus. c. Ouranopithecus. d. Kenyapithecus. Solution Sivapithecus is considered to be ancestor of modern day orangutans .... the reference for this answer is: (Palmer, 1999) Palmer, D. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. MarshallEditions, UK Hope it helps ..... Regards.