Final answer:
The painting of the Duchess shows her interacting with others, while the Duke suggests she was reserved and exclusive.
Step-by-step explanation:
The painting of the Duchess is different from the way the Duke describes her in option b) The painting shows her interacting with others, while the Duke suggests she was reserved and exclusive.
The painting captures her lively and joyful expression, while the Duke describes her as too easily pleased.
Therefore, the correct answer is b) The painting shows her interacting with others, while the Duke suggests she was reserved and exclusive.