Among the following the hardest metal is A. Gold B. Iron C. Platinum D. Tungsten

Gold is a soft metal that is often used in jewelry. It is not very strong and can be easily scratched.

Iron is a strong metal that is used in many different applications, such as in construction and manufacturing. However, it is not as hard as tungsten.

Platinum is a very dense metal that is used in jewelry and other applications. It is not as hard as tungsten.

Tungsten is a very hard metal that is used in many different applications, such as in light bulbs, X-ray tubes, and jet engines. It is the hardest metal on Earth.