Step 1: Analyze the options.
- Option (a): Agriculture is a primary occupation that directly depends on natural resources such as land, water, and soil.
- Option (b): Hunting is a primary occupation dependent on natural resources, as it involves the use of animals and ecosystems.
- Option (c): The motor industry, however, is a secondary industry that involves manufacturing and does not directly depend on natural resources in the same way as primary occupations like agriculture or hunting.
- Option (d): Lumbering depends on natural resources such as forests and trees.
Step 2: Conclude the incorrect factor.
- The motor industry is the incorrect factor as it does not qualify as a primary occupation based on natural resources.
Final Answer:
The incorrect factor is (c) Motor industry.