Final answer:
The feature of the "emerging adulthood" life stage that Lei BEST illustrates is struggles with financial independence.
Step-by-step explanation:
According to the reading on "Emerging Adulthood," the feature of the "emerging adulthood" life stage that Lei BEST illustrates is struggles with financial independence. This stage, which spans from 18 years old to the mid-20s, is characterized by a focus on work and love and is influenced by factors such as changes in the workforce and cultural expectations. The delay in entering adult roles can lead to challenges in achieving financial independence, and Lei's situation exemplifies this struggle.