The correct option is (a) E. Dubois
In 1891, Eugene Dubois unearthed the earliest known fossil of African Ape man in Java. He named the species Pithecanthropus erectus.
Arthur Keith was an anthropologist and took great interest in human evolution. He is known to reconstruct early hominid forms, especially fossils from Europe and North Africa.
Dr. Leakey was a paleoanthropologist whose research and studies led to the conclusion that humans evolved in Africa. He is also noted for conducting extensive research of primates in their wild habitats.
Raymond Dart is a celebrated anthropologist and anatomist who discovered the earliest fossil of Australopithecus africanus, an extinct hominid, related closely to humans.