The best option is iii to fund government programs.
Taxes are primarily collected by the government to finance various public services and programs that benefit society as a whole. This includes funding for education, healthcare, infrastructure, and social welfare initiatives. While other reasons like maintaining the currency’s value and ensuring surplus funds may play a role in economic management, the core purpose of taxation is to provide the necessary resources for running government operations and delivering essential services to the citizens. Without tax revenue, the government would struggle to meet its obligations and support the needs of the population.