The correct synonym for the word AMBIGUOUS is (A) Unclear. Ambiguous is a word that is interpreted in many ways, has no clear meaning, and is difficult to comprehend. Unclear refers to something that is not easily understood, visible, or interpretable, which is exactly the meaning of the word ambiguous.
Clear out means to empty a place.
Explicit is the opposite of ambiguous. It means that something is clearly stated.
Non-visible means invisible, which is not the same as ambiguous.