单选题 Natural monopolies exist because they can produce at lower costs with greater output, which means there are economies of scale. Which of the following industries is typically a natural monopoly?

A、

A. Technology.
B、

B. Utilities.
C、

C. Oil.

【正确答案】 B

【答案解析】With a natural monopoly average costs of production will be lowest when a single large firm produces the entire output demanded such as a utility.