Answer:
The answer is: Using emotional or striking language to emphasize an argument.
Step-by-step explanation:
Diction refers to choosing the right words and style of expression that the author wishes to use in a piece of writing and a rhetorical feature refers to what you can use to great effect in you writing. So, having explained these definitions we know that contrasting and positioning two extremes together in a text has nothing to do with what has just bein explained, neither the "structure of senteces" nor "stating an opposite meaning highlighting absurdity" so we have: the use of emotional language (diction) to emphasize and argument (rhetocial feature).