The correct option is C The time of bronze tools and weapons.
People in ancient age learned to make copper into copper tools and other things, although, for a metal, it is quite soft. When it was melted over fire, people learned how to make an alloy called bronze, which is much harder and stronger than copper. People made knives and weapons from bronze. This time in human history, after about 3300 BC is often called the bronze age, that is, the time of bronze tools and weapons.