Answer:
C. The idea that all knowledge is derived from observation of the five senses.
Step-by-step explanation:
em·pir·i·cism
/əmˈpirəˌsizəm/
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noun PHILOSOPHY
the theory that all knowledge is derived from sense-experience. Stimulated by the rise of experimental science, it developed in the 17th and 18th centuries, expounded in particular by John Locke, George Berkeley, and David Hume