The central theme which Hector wants his audience to remember best is theme D because he ends his speech with this theme, as expressed in option A.
The theme of a literary work - be it a novel, a poem, a speech, or an essay - is the most important message the author wishes to convey to his audience. However, one literary work is not limited to one theme. There can be many.
That is what we see in Hector's outline. Hector has four central themes in his speech, but there is one that he wants his audience to remember best, and that is theme D.
We know that because theme D is the last one discussed in his speech. Taking into consideration how fleeting people's memory and attention can be, it is a good idea to mention whatever is most important last, so that people will remember it.
With the information above in mind, we can select option A as the correct answer for this question.
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