The correct answer is A. Alkali metals
Step-by-step explanation:
The periodic table organizes and displays chemical elements in eighteenth groups according to the properties and features of the elements. The first group of elements is known as the Alkali metals; this group includes elements such as Potassium, Sodium, and Lithium. Additionally, these are classified as alkali metals because the elements of this group are highly reactive but soft metals, which are features other elements do not have. Thus, the elements in the first group are the Alkali metals.