Final answer:
Obama acknowledges that Abraham Lincoln was a flawed president by discussing weaker elements of his policies and personality, but generally focuses on his strengths and leadership during the Civil War in historical discourse. The correct option is C.
Step-by-step explanation:
President Barack Obama, in referencing Abraham Lincoln, often spoke of Lincoln's leadership qualities and his role in navigating the United States through the Civil War. Although Obama lauded Lincoln's leadership, he did acknowledge that Lincoln was a flawed president, which can be inferred from discussions surrounding Lincoln's presidency in general historical discourse, rather than specific critiques made by Obama.
The most fitting option that reflects how Obama presents Lincoln's flaws, based on his public speeches and writings, might be: c) By providing examples of weaker elements of his policies and personality. However, it should be noted that Obama's discourse often focused more on Lincoln's strengths and his critical role during a pivotal time in American history.