Why is this statement considered a theme and not a plot summary?

success is possible through hard work and perseverance.

a. it gives the chronological order of events in a story.
b. it establishes a conflict that will lead to a resolution.
c. it introduces the opinion of an author.
d. it states a universal truth about life.

It states a universal truth about life.

dr. kings dream speech

explanation:

it was late in the day and hot, and after a long march and an afternoon of speeches about federal legislation, unemployment and racial and social justice, the rev. dr. martin luther king jr. finally stepped to the lectern, in front of the lincoln memorial, to address the crowd of 250,000 gathered on the national mall.