D. so that the reader will remember the way she was mistreated
When constructing an argumentative essay, you will typically want to have three points (or arguments). The second strongest point should go first. The weakest point should go second. And, the strongest point should go last. For Zitkala to end with the strongest argument will help to ensure that readers are most greatly impacted by the point, which will certainly help them remember the she was mistreated.
