I believe the answer is: Stable characteristics
Stable characteristics is formed by the combination of various characteristics that would determine the overall behavior of a person.
These combinations are formed over a long period of time, but could be changed if the person are willing to make the effort for it.
The correct answer is:
The author's purpose for the allusion is to emphasize how seriously the relationship is doomed.
Romeo and Juliet was a tragic story. Two star-crossed lovers who could not be together, and have a sustaining relationship. Comparing Sasha and Karl to this really shows how these two face a similar proposition. Their relationship is doomed. They can't be together like Romeo and Juliet could not be together.
Where r the answer choices