Take context from the input text and decide on the accurate relationship between 'Resolution Copper' and 'copper' from the options provided.
Options: product/material produced, original broadcaster, developer, business division

Opponents also point to the foreign owners of Resolution Copper Mining, a subsidiary of British-Australian Rio Tinto and Australian BHP Billiton, saying it's unclear how much of the profits and the copper will stay in the U.S.
product/material produced