Answer:
Cause and effect
Explanation:
The excerpt structure clearly shows cause and effect relationship as the sentence follows a pattern showing the reason or cause of a certain phenomen and the its effect. With the author highlighting the reason they had to ride segregated buses as being their inability to afford a car. Chronological lists events in order of occurrence. While problem and solution highlights an issue and it is followed up by the cure or remedy.
I believe the answer is conflict. I hope this helps!:)
