<em>Answer:</em><em>Take your coin or piece of jewelry, and place a strong magnet on top see if the magnet sticks to the object by the magnetic pull, or if it slides off onto the ground. If the metal attracts the magnet, you know it must be an alloy mixture and not a precious metal.</em>
I would say that the answer is his strength.
During the Trojan War, Achilles was a great warrior known for slaying Hector outside the gates of Troy. His resilience was one of his greatest strengths as he was dipped in the waters of the River Styx in the Underworld as a child, granting him invulnerability all over his body. However, he had one weakness: his heel. His mother held onto his heel while dipping him in the River Styx, and thus, this is the only place on his entire body that could kill him. Achilles got overconfident as a result of his immunity, and he was caught off guard when Paris presumably shot him in the heel with an arrow, killing the great warrior.
I have read the Odyssey last year as a freshman in 9th lit and my answer would be A.