The statement that contains what is most likely the reason for the author to include criticisms by Lucy Stone, Thurgood Marshall and Benjamin Franklin is "She wants to show how criticisms helped improve the Constitution over the years." (fourth option)
As we know, the Constitution is the most important law in the US, the document that determines how the country should be governed. Therefore, there must be a reason for the author to include criticisms to the Constitution in her text.
Notice that the criticism she mentions comes from people who made history. Franklin, Marshall, and Stone were all people who fought for the improvement of the American society. Thus, their criticism aimed to improve the Constitution itself.
With that in mind, we can say the author's purpose was to show how the Constitution was improved over the years thanks to the criticism by those figure, who saw issues that deserved to be addressed, such as the universal right to vote.
The missing answer choices for this question are the following:
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