Answer:
King uses both techniques at the same time so that he can emphasize important ideas.
Step-by-step explanation:
The chosen sentence, with the conjunction so that, is the one which best resembles, combines and connects the ideas in sentences two and three.
The rest of the alternatives possess simple sentences with no transitional phrase or connector to join them. Besides, some of them either omit the information provided in the original sentences or do not make sense.