Option c is the correct answer Copper was the first metal to be used by men. Copper was first used by man over 10,000 years ago. Probably copper can be found as a naturally occurring native metal that is sometimes found in large lumps on the ground. People learned to make this into copper tools and other things, although, for a metal, it is quite soft. When it was melted over the fire, people learned how to make an alloy called bronze, which is much harder and stronger than copper. During chalcolithic period copper was used onlarge scale. In Indus Valley Civilization the metals like bronze, silver and gold were used and in later Vedic period iron came into existence.