The correct answer to this open question is the following.
You forgot to mention or attach the lenses that you refer to in the question. However, we can answer is general terms.
When we talk about the term "lens" in research, we are referring to a specific perspective to examine the topic at hand or the study. We can use philosophical lenses, economic, organizational, social, or psychological theories.
So we do not what lens you chose, but whatever your choice was, this lens might change how you approach researching your topic, thus affecting the historical narrative, because that particular approach is going to offer you different sources, authors, perspectives, and research lines to be followed. Your historic narrative would suffer modifications because you will have so many approaches to include in your research.
The ten percent
The ten percent plan, formally the Proclamation of Amnesty and Reconstruction (13 Stat. 737), was a United States presidential proclamation issued on December 8, 1863, by President Abraham Lincoln, during the American Civil War. By this point in the war (nearly three years in), the Union Army had pushed the Confederate Army out of several regions of the South, and some rebellious states were ready to have their governments rebuilt. Lincoln's plan established a process through which this postwar reconstruction could come about.[1]
Answer:
Aryans from central Asia invaded South Asia and introduced the caste system as a means of controlling the local populations.
The correct answer of the given question above would be the second option, option B, AGRICULTURALLY UNPRODUCTIVE LAND. What most likely caused the fifteenth-century decline of Great Zimbabwe is the agriculturally unproductive land. Hope this answer helps. Thanks for posting your question.