please help me with this question

Suppose the public holds 20% of their money as currency and the rest as deposits in their banks. Moreover, the central bank requires banks to maintain a reserve-deposit ratio of 10%. What will be the change in the total money supply if the central bank buys $5 million of government bonds from the public and pays for them by creating money? O a. The money supply will decrease by $17.9 million O b. The money supply will increase by $62.5 million O c. All of the answers here are incorrect O d. The money supply will increase by $17.9 million O e. The money supply will decrease by $62.5 million