A government's revenue refers to the income it collects from various sources.
Revenue is the money that a government collects from different sources such as taxes, fees, fines, duties, and sales of goods and services. This revenue is used to fund public goods and services that the government provides to its citizens, such as infrastructure, education, healthcare, and public safety.
While a government's revenue is used to fund public goods and services, the revenue itself specifically refers to the income collected by the government from different sources. Therefore, the correct answer is "the income it collects from various sources".