"It is important to both choose and adjust the tone (style) of our essay. The formal essays usually share some common characteristics: (i) state the topic clearly in the introduction; (ii) have a clear topic sentence and an organized order of points (1) solution
(2) mechanism
(3) result(s)
(4) flaw in each paragraph; (iii) use linking words and phrases; (iv) include relevant quotation or generalization."

Now as for this topic, sort styles which this essay should be written in from the most suitable (()) to the least suitable (()).