The answer "Οι Ιπποδρομίες" is the correct answer because it is the only option that is related to horse racing, which is mentioned in the question. "Η τοξοβολία" refers to archery and "Οι μονομάχοι" refers to dueling, neither of which are mentioned in the question. Therefore, "Οι Ιπποδρομίες" is the most logical and appropriate answer.