Hamilton justified the establishment of a national bank by: having it hold funds lending money closing on mortgages developing currency

lexander Hamilton justified the establishment of a national bank primarily by emphasizing its role in developing currency and stabilizing the nation's financial system. He argued that a national bank would provide a uniform currency, facilitate government transactions, and help manage the country's debt. Additionally, the bank would lend money to stimulate economic growth and hold government funds securely. Therefore, the most relevant justification from your list is "developing currency."