Explanation:

The odd one out from the given elements is Carbon.

Reason:

To identify the odd one out among the given elements, we need to consider their properties and characteristics.

1. Gold:
Gold is a chemical element with the symbol Au (from the Latin word "aurum"). It is a dense, soft, malleable, and ductile metal with a bright yellow color. Gold is known for its high value and has been used for centuries in jewelry, currency, and various other applications. It is a transition metal and is classified as a noble metal. Gold is not reactive and does not easily corrode or tarnish.

2. Potassium:
Potassium is a chemical element with the symbol K (from the Latin word "kalium"). It is an alkali metal and belongs to Group 1 of the periodic table. Potassium is a soft, silvery-white metal that reacts violently with water and air. It is highly reactive and is essential for various biological processes in living organisms. Potassium is commonly found as salts in minerals and is used in fertilizers, explosives, and medicinal applications.

3. Carbon:
Carbon is a chemical element with the symbol C. It is a nonmetal and belongs to Group 14 of the periodic table. Carbon is the basis of all organic compounds and is present in all living organisms. It is known for its ability to form a wide variety of compounds, including hydrocarbons, which are the building blocks of organic matter. Carbon has several allotropes, such as diamond, graphite, and fullerenes. It is an essential element for life and is found in various forms, including coal, oil, and natural gas.

4. Platinum:
Platinum is a chemical element with the symbol Pt. It is a dense, malleable, and ductile metal with a silvery-white color. Platinum is known for its resistance to corrosion, high melting point, and catalytic properties. It is a transition metal and belongs to Group 10 of the periodic table. Platinum is used in various applications, including jewelry, catalytic converters, electrical contacts, and laboratory equipment.

Conclusion:

The odd one out among the given elements is Carbon because it is the only nonmetal among the options. Gold, Potassium, and Platinum are all metals belonging to different groups of the periodic table.

Option C is correct because exept carbon ( non-metal ) all three are metals ( gold,potassium,platinum ) .