Final answer:
Option 3, comprising of Cadmium (Cd) as the metal, Antimony (Sb) as the metalloid, and Iodine (I) as the nonmetal, is the correct answer. These are categorized based on their positions on the periodic table.
Step-by-step explanation:
The question asks which list of elements contains a metal, a metalloid, and a nonmetal. To answer, we examine each option by the position of the elements in the periodic table.
Option 3 consists of Cadmium (Cd) as the metal, Antimony (Sb) as the metalloid, and Iodine (I) as the nonmetal. Cadmium is to the left of the metal-nonmetal dividing line in the periodic table, categorizing it as a metal. Antimony is a metalloid because it is located along the diagonal line known for metalloids. Iodine is a nonmetal as it is situated above and to the right of this line.
The elements in the other options fail to fit the criteria of containing one metal, one metalloid, and one nonmetal. Therefore, Option 3 is the correct answer.