The most accepted line of descent in human evolution is 
 

1. Australopithecus → Ramapithecus → Homo sapiens → Homo habilis 
2. Homo erectus → Homo habilis → Homo sapiens
3. Ramapithecus → Homo habilis → Homo sapiens
4. Australopithecus → Ramapithecus → Homo erectus → Homo habilis → Homo sapiens