Option (B) Trading is the correct answer. The provided context explicitly states that tertiary activities involve 'production and exchange', noting that exchange specifically includes 'trade, transport and communication facilities'. It further clarifies that 'trade, transport, communication and services are some of the tertiary activities' and defines trade as 'buying and selling of items produced elsewhere'. In contrast, Farming and Hunting are primary activities involving direct extraction from nature, while Weaving is a secondary activity involving manufacturing.