Explanation:

- Option 1: New countries – The firm may explore markets or regions where the mineral is untapped or scarce to diversify and increase its reserves.

- Option 2: Remains the same – Holding existing operations and not expanding further despite high prices. This option usually lacks growth opportunities.

- Option 3: New miners – Hiring additional miners might help increase production, but it does not directly address expanding resources or finding undiscovered minerals.

- Option 4: New deposits – High prices often motivate firms to search for unexplored deposits, expanding their reserves and capitalizing on high prices by increasing accessible resources.

- Correct Answer: Option 4 – New deposits is indeed correct. High mineral prices typically drive firms to locate and develop new deposits to maximize profits.