Which of the following describes an idea that is "opaque"?

The term "opaque" is used to describe something that is not transparent or clear. When applied to ideas or expressions, it suggests that they are difficult to see through or understand. Therefore, when an idea is described as "opaque," it means that it is not clearly understood or expressed, aligning perfectly with the selection. This complexity can arise from convoluted language, abstract concepts, or lack of clarity in communication, making it hard for the audience to grasp the intended meaning.

The other choices convey attributes of clarity and straightforwardness, which are the opposite of what "opaque" represents.