The option that is the best example of a theme in a speech is "What the past can teach us", i.e., option D.
What is a speech?
The communication or expression of thoughts in spoken words is referred to as speech.
An image, a metaphor or a powerful word that adds interest to the remarks can be a theme of a speech.
The option that is the best example of a theme in a speech is "What the past can teach us".
Thus, the correct option is D.
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