Concept:Extraction is the process of obtaining raw materials directly from natural sources such as the land and sea.
Explanation:Raw materials like minerals, metals, and marine resources are derived from nature.
When an activity involves removing or collecting these materials from land or water, it is called extraction.
Agriculture and farming focus on growing crops and rearing animals, not on deriving resources from the sea.
Construction uses already processed materials to build structures, so it does not involve derivation.
Thus, the activity described in the question is extraction.
Answer:C. extraction