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.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which statement is an opinion about the element copper?
Possibilities:
- 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.