Final answer:
The example of figurative language mostly seen in paragraph 4 of MLK's speech is repetition.
Step-by-step explanation:
The example of figurative language mostly seen in paragraph 4 of MLK's speech is repetition. Repetition is a rhetorical device where a word or phrase is repeated for effect. In this paragraph, MLK repeats the phrase 'I have a dream' multiple times, which emphasizes his vision for racial equality and inspires hope in the audience.