Final answer:
A natural monopoly usually allows government regulation of its prices and services, ensuring fair access and prices for consumers.
Step-by-step explanation:
The true statement about a firm with a natural monopoly is that it usually agrees to allow the government to control the price and service provided. This is because a natural monopoly occurs when a single firm can supply the entire market demand at a lower cost than multiple firms, often due to high fixed costs and low variable costs. Therefore, to prevent the possibility of unfair price manipulation and to ensure the service is accessible, governments typically regulate these monopolies, sometimes by controlling prices and services, as is common with public utilities like electricity and water service.