Explanation:

- Correct Answer: Option 2 - Silver

- Gold:

- Although referred to as "gold medals," the majority of a modern Olympic gold medal's weight is not composed of gold.

- Only a minimal layer of pure gold is applied to the medal's surface.

- Silver:

- The core material of a modern Olympic gold medal is predominantly silver.

- In the 2020 Tokyo Olympics, the gold medals were made of at least 92.5% silver.

- Copper:

- Copper is not a significant component of Olympic gold medals.

- It is more associated with bronze medals, where it is combined with tin and sometimes zinc.

- Bronze:

- Bronze medals are primarily made of copper and tin, not related to gold medals.

In summary, modern Olympic gold medals are primarily made of silver, with a small coating of gold.