Step 1: Understanding the Concept:
This question requires knowledge of the history of paleoanthropology, specifically matching important hominin species with the scientists who discovered and/or named them.
Step 2: Detailed Explanation:
- A. A. afarensis: The most famous specimen is "Lucy," discovered in Ethiopia in 1974 by a team led by American paleoanthropologist Donald Johanson. So, A matches with III.
- B. A. boisei: The type specimen, OH 5 or "Zinjanthropus," was discovered at Olduvai Gorge, Tanzania, in 1959 by Mary Leakey. Her husband, Louis Leakey, was the director of the expedition and initially named the species. So, B matches with IV.
- C. A. africanus: The type specimen is the "Taung Child," a fossilized skull of a young individual discovered in 1924 in Taung, South Africa. It was identified and named by Australian anatomist Raymond Dart. So, C matches with I.
- D. A. robustus: The type specimen was found at Kromdraai, South Africa, and the species was named in 1938 by Scottish-South African doctor and paleontologist Robert Broom. So, D matches with II.
Step 3: Final Answer:
Combining the matches:
A $\rightarrow$ III
B $\rightarrow$ IV
C $\rightarrow$ I
D $\rightarrow$ II
The correct combination is A-III, B-IV, C-I, D-II, which corresponds to option (D).