Answer:
B) Harrison is identified as a genius and athletic- and then referenced as a dangerous threat.
Explanation:
The irony is the figure of language that consists in the use of a word or expression so that it has a different meaning from the habitual one. The irony must stimulate reasoning, it should make the reader (or listener) consider the various possible meanings that a given word or expression can have, until finding the one that fits the message producing meaning.
In "Harrison Bergeron" irony is used when Harrison is identified as a genius and athletic, this should be something good, it should be treated as a positive feature of the boy, but soon after, he is referred to as a dangerous threat, because of its positive characteristics.