Answer:
The appropriate answer is a single weakness
Step-by-step explanation:
The poem makes reference to the Greek hero Achilles and his well-known flaw, the heel. Greek legend describes Achilles as a warrior who was all but unbeatable, but for his weak heel. He finally failed because of this flaw.
The poem's phrase "Math class was his Achilles' heel" implies that although Reginald did well in most of his classes and almost always had perfect scores, math class was his demise. He tried hard, but he couldn't get an A in math, much as Achilles' weakness in his heel kept him from becoming unbeatable.
As a result, Reginald's failure to do well in math class serves as a metaphor for a particular weakness or difficulty, as shown by the connection to Achilles and his Achilles' heel.