The correct option is C. It shows a positive effect of the solution.
The topic of the presentation is the impact of excessive homework on highschool. The word "excessive" implies that the amount of homework given at highschool has a negative effect on students. The solution would be to have "less homework" and she finds out a positive effect of such a solution. If students are given less homework, they will have time to do other enriching activities and spend time bonding with their loved ones.
I believe that the answer to the question provided above is the Harlem culture lead to civil rights movement since Harlem renaissance is the rise of the negros which are the most affected by racism.
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Explanation: the answer is problem-solution
There is no underlined word.
Sally is a Direct Object
Best is a predicate adjective
Is is a predicate nominative