The Roman's defeat of Carthage transformed the Western Mediterranean by making Rome the dominant power in the entire region.
Option B is the correct answer.
<h3>What was Carthage?</h3>
Carthage was the ancient colony of Rome that collapsed in 146 BCE after the Punic wars.
Punic wars were the combination of wars between Romans, Republics, and the Carthaginian Empire that arose in 264 BCE which led to the falling down of Carthage, end to the slavery of Carthaginian people, and increasing the control of Roman over the western part of Mediterranean.
Therefore, Rome became the superpower in the Western Mediterranean after defeating Carthage.
Learn more about Carthage in the related link:
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