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The correct answer is option 3: "its appearance is like silver."
German silver is actually not made of silver at all. It is a type of alloy made from copper, nickel, and zinc. The reason it is called "German silver" is because it has a similar appearance to silver. When polished, German silver can have a shiny, silver-like finish, which makes it suitable for making decorative articles, coinage metals, and ornaments.
Option 1 is incorrect because German silver does not contain actual silver as one of its components. It is primarily made up of copper, nickel, and zinc.
Option 2 is incorrect because Germans were not the first to use silver. Silver has been used by many cultures throughout history.
Option 4 is incorrect because German silver is not an alloy of silver. Again, it is primarily composed of copper, nickel, and zinc.
In conclusion, German silver is called so because of its appearance, resembling silver, even though it does not actually contain silver.