Identify and describe one past geologic process that formed copper ore deposits

What I do know is that Copper is a metal that has been deposited from hot sulphur solutions, created in volcanic regions. The hot solutions concentrated the copper up to a thousand times more than would normally be found in rocks. The resultant enriched rocks are called copper ores. I hope this helps.

Ithink it is letter b, i may be wrong but i think that is the answer