Copper is a good conductor of electricity. Copper mixed with silver is expensive. Copper can be pounded into many shapes. Copper is an excellent conductor of heat.
Which statement is an opinion about the element copper?

Options:
- Copper is a good conductor of electricity.
- Copper mixed with silver is expensive.
- Copper can be pounded into many shapes.
- Copper is an excellent conductor of heat.

Copper mixed with silver is expensive.