A- Those who ascribe to a philosophy of naturalism readily embrace the possibility of miracles.
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.