Which of the following statements about economic sectors are true? I. A subsistence farmer and a miner both are employed in the primary economic sector. II. A person who works in a bread factory is employed in the primary economic sector. III. A construction worker is employed in the secondary economic sector. IV. An airline pilot is employed in the tertiary economic sector.

The primary sector involves obtaining raw materials, so subsistence farming and mining are both primary-sector activities (I is true). Making bread in a factory is manufacturing, which belongs to the secondary sector, so II is false. Construction is also part of the secondary sector, while flying passengers is a service in the tertiary sector (III and IV are true). Therefore, the correct choice is C: I, III, and IV.

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