The correct answer is A. To reveal the traumatic impact the Holocaust had on his life.
Elie Wiesel, a Holocaust survivor, wrote All Rivers Run to the Sea as a memoir, which is a personal account of his experiences and the profound effects those experiences had on him. The memoir serves to document and reflect upon the trauma he endured during the Holocaust and how that shaped his life afterward. Wiesel's writings often focus on themes of suffering, memory, and the moral responsibility to remember the past, which aligns closely with the choice A.
While the other options have merit, they do not encapsulate the primary reason he wrote this memoir. Option B may imply a broader political motivation that is not the main focus of Wiesel's personal narrative. Option C is too specific and not directly related to Wiesel’s personal experiences, and option D, while potentially relevant in a more communal sense, does not specifically reflect Wiesel's own primary intention in this memoir, which is to document and convey his personal trauma. Thus, option A is the most fitting explanation for why he wrote this memoir.