Final answer:
The correct answer is Iron (Fe), which is a transition element, found in Group 8, Period 4 of the periodic table. It plays a critical role in hemoglobin within red blood cells.
Step-by-step explanation:
The question is asking to identify which of the given options is a transition element.
Transition elements are the elements found in the d-block of the periodic table and are known for their ability to form compounds with vibrant colors due to the d-orbital electrons transitioning between energy levels. Among the options provided. Therefore, the correct answer is Iron, which is a transition element widely known for its role in the human body, specifically in hemoglobin within red blood cells for transporting oxygen. It's atomic number is 26.