Which of the following from "to build a fire"is an effective use of juxtaposition?
answer

"several times he stumbled, and finally he tottered, crumpled up, and fell."

the dog sat "in front of him, facing him, curiously eager and intent"

the man drowsed off into "the most comfortable and satisfying sleep he had ever known."

"ƒ the man reached in his pocket for a second piece of birch-bark."

The best and most correct answer among the choices provided by your question is the second choice or letter B "The dog sat "in front of him, facing him, curiously eager and intent"."

Juxtaposition is a literary technique in which two or more ideas, places, characters and their actions are placed side by side in a narrative or a poem for the purpose of developing comparisons and contrasts.

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