Step 1: Concept Overview:
This question tests knowledge of paleoanthropology, specifically the association between hominin species and their discoverers/namers.
Step 2: Detailed Explanation:
- A. Australopithecus afarensis: "Lucy," the most famous specimen, was discovered in Ethiopia in 1974 by a team led by Donald Johanson. Therefore, A corresponds to III.
- B. Australopithecus boisei: The type specimen, OH 5 ("Zinjanthropus"), was discovered in 1959 at Olduvai Gorge, Tanzania, by Mary Leakey. Louis Leakey, her husband and expedition director, initially named the species. Thus, B corresponds to IV.
- C. Australopithecus africanus: The "Taung Child," a fossilized skull discovered in 1924 in Taung, South Africa, is the type specimen. Raymond Dart, an Australian anatomist, identified and named it. Hence, C corresponds to I.
- D. Australopithecus robustus: The type specimen was found at Kromdraai, South Africa, and the species was named in 1938 by Robert Broom, a Scottish-South African doctor and paleontologist. Consequently, D corresponds to II.
Step 3: Final Solution:
Matching the species to their discoverers:
A $\rightarrow$ III
B $\rightarrow$ IV
C $\rightarrow$ I
D $\rightarrow$ II
The correct match is A-III, B-IV, C-I, D-II, which is option (D).