Understand the concept of a supply chain: it is the sequence of processes involved in the production and distribution of a commodity.
Identify the starting point of the supply chain, which is the very first step in the process of creating a product.
Recognize that before marketing, transportation, or final sale, the supply chain must begin with obtaining the basic inputs needed for production.
Know that these basic inputs come from the extraction of raw materials, which are the natural resources used to create goods.
Conclude that the supply chain starts with the extraction of raw materials, as this is the foundation for all subsequent steps in production and distribution.