Which of the following is true about a firm with a natural monopoly

a - it usually agrees to allow the government to control the price and service provided

b - it offers many different goods and services

c - it is usually very inefficient

d - it is an example of perfect competition

Natural monopolies are rare, but occur when start up costs are high, the industry requires unique technology or natural resources, etc. IN the rare case of a natural monopoly, the government will allow them to exist, but with government oversight to protect consumers from pricing gauging.