Answer: D
Step-by-step explanation:
At the start of the First Punic War, Rome and Carthage were the sole two powers of the Mediterranean with similar military strenght and economic power. The expansion of Carthage into the island of Sicily would have meant the decrease of Rome's political and economic influence over the region, as such war was declared to safeguard Rome's interests, but it only centered around the area of Sicily and Sardinia.