What would Democritus classify himself as based on his belief in external sources of knowledge?

Democritus can be classified as an Empiricist because his philosophical stance emphasized the importance of sensory experience as the basis of knowledge. He believed that knowledge was derived from the observations of the physical world, asserting that the universe is composed of small, indivisible particles called "atomos." This belief underpinned his view that understanding comes from what we can perceive and measure in the material world, aligning closely with the core tenets of empiricism.

Empiricism prioritizes experience and evidence gained through the senses, as opposed to ideas stemming solely from reason or innate knowledge. In the context of the options provided, Democritus's emphasis on observation and sensory input as the foundation of knowledge distinctly characterizes him as an Empiricist.