Zitkala sa presents her strongest argument at the end of passage:

a. so that the reader will forget the details from the rest of the passage
b. in order to hide her weaker arguments
c. in order to create a less serious mood
d. so that the reader will remember the way she was mistreated

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.  

the second sentence is a great revision in my opinion. that would be a great topic.

explanation:

sing because that is what they are doing in the sentence

explanation:

the simple predicate is the main verb in the predicate that tells what the subject does. example: my father fixed the dryer. read each sentence. draw a line under the complete predicate.