The country has a potential to exploit more mineral resources.

Answer: Option B

Fortune : chance or luck as an arbitrary force affecting human affairs.
Possibility : a thing that may happen or be the case.
Capacity : the maximum amount that something can contain.
Luck : success or failure apparently brought by chance rather than through one's own actions.
Potential : the possibility of something happening or of someone doing something in the future.

Synonym of Potential is Possibility