Concept:Economic activities expand through commerce, which is broadly divided into trade and the supporting services known as aids to trade.
Explanation:The scope of economic activities is widened by engaging in commerce.
Commerce consists of two main parts: trade (buying and selling of goods and services) and aids to trade.
Aids to trade include services that facilitate trade, such as transportation, banking, insurance, warehousing, advertising, and communication.
Transportation alone, banking alone, or business promotion alone only cover part of the process.
It is the combination of trading activities and supporting services that fully enlarges the scope of economic activities.
Answer:B. trading and aids to trade