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Option 1: Ghiyasuddin Tughlaq - There is no historical evidence to suggest that Ghiyasuddin Tughlaq issued copper coins instead of silver ones.
Option 2: Muhammad bin Tughlaq - This is the correct answer. Muhammad bin Tughlaq, the second Sultan of the Tughlaq dynasty, issued copper coins instead of silver ones. This decision was made due to a shortage of silver in the empire.
Option 3: Firoz Shah Tughlaq - Firoz Shah Tughlaq did issue copper coins, but he also issued silver coins, so he did not exclusively issue copper coins.
Option 4: Mahmud Tughlaq - There is no historical evidence to suggest that Mahmud Tughlaq issued copper coins instead of silver ones.
In summary, Muhammad bin Tughlaq was the Sultan of the Tughlaq dynasty who issued copper coins instead of silver ones due to a shortage of silver in the empire.