Final answer:
The correct answer is option A. Achilles.
Step-by-step explanation:
The son of the military man Peleus and the sea-nymph Thetis, the most powerful warrior in The Iliad, is Achilles. This character is renowned for his unmatched prowess in battle and his central role in Homer's epic. It is Achilles who leads the Myrmidons and who feels deeply slighted when his prize, Briseis, is taken from him setting the stage for the main conflict within the narrative of The Iliad.
Achilles' mother, Thetis, sought to make her son invincible by dipping him in the river Styx, inadvertently leaving his heel vulnerable, which would later be known as his Achilles heel, representing a singular point of weakness.