Final answer:
A crab fisherman's activities fall under the primary economic sector, specifically wholesaling and mining (option c). Activities like subsistence agriculture are also part of this sector.
Step-by-step explanation:
The activities of a crab fisherman who goes out to sea, catches crabs, and sells them to larger distributors fall under the primary economic sector of business activity. This sector is characterized by activities related to the extraction and collection of natural resources, such as fishing, agriculture, forestry, and mining. Therefore, the correct answer to the question is: the crab fisherman's activities fall under Wholesaling, Mining - option (c).
An example of another type of activity in the primary economic sector is subsistence agriculture, where farmers grow crops and rear animals primarily for their own consumption and local exchange. Unlike commercial agriculture, which is intended for the broader market, subsistence agriculture focuses on self-sufficiency.