Answer:
D. Carthaginians
Step-by-step explanation:
The turning point in Roman history was their struggle, in the Punic Wars, with the D) Carthaginians. These wars, particularly the Second Punic War (218-201 BC), led by the Carthaginian general Hannibal, were significant conflicts that ultimately resulted in Rome's victory and expansion of its influence in the Mediterranean region, marking a crucial point in Roman history.