Step 1: Understanding the Concept
A connecting link shows features of both groups.
Step 2: Australopithecus
Australopithecus had a small ape-sized brain and a projecting face, but walked upright on two legs and had human-like teeth.
Step 3: Other options
Dryopithecus is considered a common ancestor of apes and man, Ramapithecus was more man-like but not a link in this sense, and Homo habilis was already a human species.
Final Answer:
Australopithecus is the connecting link between ape and man.
\[ \boxed{\text{(C) }\text{Australopithecus}} \]