Answer:
A. memorable
Step-by-step explanation:
When writing in spatial order, the goal is to present details in a logical sequence based on their physical location or arrangement. The conclusion of the piece should bring together all the details presented, giving a final impression that is meaningful and significant. The best choice for the blank in this question is "memorable" since the conclusion should leave a lasting impact on the reader's mind, making the subject unforgettable. This can be achieved by summarizing the most important details or adding a memorable final detail that ties everything together.