Explanation:

- Gold and copper absorb blue and violet light. This is why they reflect yellow light. These metals have specific electron configurations enabling this absorption.

- Option 1: Green light is absorbed differently. It usually doesn't lead to yellow reflection.

- Option 2: Blue—Light absorbed by metals like gold and copper. Their electron structures allow this, turning absorbed blue into reflected yellow.

- Option 3: Red is often not absorbed by these metals for yellow reflection.

- Option 4: Orange light absorbs differently and isn’t part of the process turning absorbed light into yellow.

- Yellow is a complementary color to the absorbed blue and violet.