Correct Answer: D. (d), (c), (a), (b)
Solution:Arranging the activities based on their occurrence in prehistory from the oldest to the youngest:
• Communal hunting of elephants at Ambrona dates back to the Lower Paleolithic period, approximately 400,000 years ago.
• Caring for the old cripple at La Chapelleaux-Saints occurred during the Middle Paleolithic period, around 50,000 years ago.
• Manufacture and use of bone flutes at Isturitz belong to the Upper Paleolithic period, around 35,000 years ago.
• Use of bone points and antler frontlets at Star Carr is from the Mesolithic period, around 9,000 years ago. Hence, correct sequence are (d), (c), (a), (b).