Which term best describes something that is clearly visible or understood?

The term "obvious" is the most accurate choice to describe something that is clearly visible or understood. When something is obvious, it stands out and is easily perceived or comprehended without the need for further explanation or clarification. For instance, if a statement is clear and straightforward, it can be recognized and accepted without confusion; this aligns perfectly with the notion of being clearly visible or understood.

In contrast, the terms "obscure," "ambiguous," and "complicated" convey notions of difficulty or lack of clarity. Something that is obscure is hidden or not easily seen, while ambiguous refers to something that can be interpreted in multiple ways, leading to uncertainty. Complicated indicates intricate or complex arrangements that make understanding or visibility challenging. Therefore, "obvious" directly addresses the clarity and straightforwardness implied in the question, making it the correct term.