What does the term 'implausible' refer to?

The term "implausible" refers to something that is not believable or unlikely to happen. It suggests a lack of credibility or reason to be considered true. Thus, the correct answer indicates that something is not possible or not imaginable, aligning with the definition of "implausible." This term is often used to describe scenarios, arguments, or explanations that seem far-fetched or unreasonable within a given context.