Economic activities are categorized based on the nature of the work and the production process involved.
Step 1: Identify Primary Activities.
Primary activities involve the direct extraction or harvesting of natural resources from the earth. Agriculture (Option A) and Hunting (Option D) are primary sector activities as they rely directly on environmental resources.
Step 2: Identify Secondary Activities.
Secondary activities involve the processing or manufacturing of raw materials into finished goods. Knitting (Option B) transforms raw yarn or wool into a garment, classifying it as a secondary activity.
Step 3: Identify Tertiary Activities.
Tertiary activities do not produce a physical good. Instead, they provide services that support the primary and secondary sectors, as well as the general public. Trade (Option C) involves the exchange of goods and services. It acts as a bridge between the producer and the consumer without creating a new physical product, thus making it a tertiary activity. Final Answer: Trade