The section presents a question related to chemistry, specifically focusing on the reactivity of certain elements with acids. The question asks which element reacts strongly with acids, providing four options: A. Iron (Sắt), B. Aluminum (Nhôm), C. Zinc (Kẽm), and D. All of the above (Tất cả các đáp án trên). The key topics include chemical reactivity and the specific elements mentioned.