"Delineate" means to describe or portray something precisely or to indicate the exact position of something. It can also refer to the action of marking the boundaries or outlines of something.
Based on your multiple-choice options, none of them directly define "delineate," but it most closely relates to the idea of "to break down" in the sense of clarifying or defining something. However, it's important to note that "delineate" does not mean "to break down" in the same context.