Correct Answer: A. (a), (d), (b), (c)
Solution:Arranging the fossils in ascending order based on the year of their first discovery:
• Neanderthal First discovered in 1856 in the Neander Valley, Germany.
• Cro-Magnon Discovered in 1868 in France.
• Pithecanthropus (now known as Homo erectus): Discovered in 1891 in Java, Indonesia.
• Australopithecus First discovered in 1924 in South Africa.
Hence, correct ascending order is (a), (d), (b), (c).