Final answer:
Argon is a Noble Gas.
Step-by-step explanation:
The Noble Gases are a group of chemical elements that are odorless, colorless, and non-reactive under normal conditions. They are located in Group 18 on the periodic table. The correct answer to your question is argon. Oxygen and fluorine are nonmetals, and Usenic is not a valid chemical element.
Learn more about Noble Gases