Answer:
It demonstrates that Enrique takes drastic measures to survive.
Step-by-step explanation:
Sonia Nazario's "Enrique's Journey" follows a young boy named Enrique who's traveling to the United States in search of his mother. The story follows the difficult journey of the young boy and the obstacles that posed problems for him.
In the given excerpt from the story, the narrator reveals how Enrique ensured he stays safe during the whole trip. His behavior "every time someone new jumps onto his car" shows his anxious state. Moreover, when he decided to "climb to the top of the tank car and take a running leap . . . jump[ing] to one swaying boxcar, then to another" shows the extreme steps that he took to ensure he survives the journey.
Thus, the correct answer is the fourth option.