The correct answer is option 'B' - Primary.

Explanation:
Primary activities are those that involve the extraction and production of natural resources. These activities are directly related to the use of natural resources in their raw form. They are often the first step in the production process and are essential for the development of other industries.

Primary activities can be further classified into three main categories:

1. Extractive industries:
- These include activities such as mining, fishing, forestry, and agriculture.
- Mining involves extracting minerals and metals from the earth's crust.
- Fishing involves catching fish and other marine organisms from rivers, lakes, and oceans.
- Forestry involves the extraction of timber and other forest products.
- Agriculture involves the cultivation of crops and the rearing of animals for food, fiber, and other products.

2. Raw material processing:
- This includes activities such as processing and refining of raw materials obtained from extractive industries.
- For example, raw materials extracted from mines are processed and refined to obtain metals and minerals that can be used in various industries.
- Similarly, raw materials obtained from forestry and agriculture are processed to obtain timber, paper, textiles, and other products.

3. Construction:
- Construction activities are also considered primary activities as they involve the use of natural resources, such as timber, stone, sand, and gravel.
- Construction includes the building of infrastructure, such as roads, bridges, buildings, and dams.

Primary activities are usually location-specific and depend on the availability of natural resources in a particular area. These activities are often labor-intensive and have a significant impact on the environment. They provide the basic raw materials for secondary and tertiary activities, which involve the processing, manufacturing, and service sectors of the economy.