Which word indicates a situation that is fitting or appropriate?

The word "apposite" specifically means something that is relevant or appropriate in a given context. It conveys the idea of being well-suited for the circumstances or situation at hand, thus indicating suitability and relevance. For example, in a discussion, a comment that directly addresses the topic being discussed would be considered apposite because it adds value and clarity to the conversation.

In contrast, the other choices have different meanings: "anodyne" refers to something that relieves pain or is not likely to provoke dissent, typically used in a medical or metaphorical context; "apocryphal" pertains to stories or statements of doubtful authenticity, often associated with legends or myths; while "errant" describes something that strays from the proper course or standard, implying an element of error or deviation. This makes them less suitable for describing a situation that is fitting or appropriate.