Final answer:
The behavior of Isabella in public was primarily driven by her desire for attention.
Step-by-step explanation:
The behavior of Isabella in public was primarily a result of her desire for attention.
In the passage, Lucy mentions that Isabella's agent advised her to make a scene wherever she went in order to get noticed.
This indicates that Isabella's actions were driven by her need for attention.
Additionally, Lucy mentions that the Isabella people saw in public was just a persona she created, suggesting that her behavior was not her genuine personality but rather a deliberate act to attract attention.
Therefore, the correct answer is c) Her desire for attention.