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.

Statements I, III, and IV are correct, but statement II is not.

Explanation:

The primary economic sector is the one that works in the obtaining and exploitation of raw materials, or whose production is the result of nature (for example, livestock, agriculture, fishing or mining).

In turn, the secondary sector is the one that transforms the raw material provided by the primary sector into processed products. For example, factories or construction.

The tertiary sector, on the other hand, is the one that provides services with products made by the secondary sector. For example, communications, transportation or commerce.

Bread making is the transformation of the raw material into an elaborated product, therefore, it belongs to the secondary economic sector, and not to the primary one as statement II says.