Answer:
The piece that best supports Selena's analysis is "For a while, he stands on a narrow ledge at the end of a fuel tanker. It is just inches above the wheels. He cannot let himself fall asleep; one good shake of the train, and he would tumble off."
Step-by-step explanation:
The analysis of the writer of Enrique's Journey shows why it is dangerous for migrants to sleep during their trip north. She states that if an immigrant falls asleep during the trip, she could die crushed by the train if it were to shake.