The correct answer is: B. composure.
Equanimity is the state of being calm and level-headed, even in difficult or challenging situations. The lady in the question is able to maintain her composure even after losing her jewels, which shows that she is a person of great strength and resilience.
The other options are incorrect because they do not accurately describe the lady’s state of mind. Temper refers to a person’s mood or disposition, and it is often used to describe someone who is easily angered. Affability refers to a person’s friendly and pleasant nature. Humour refers to a person’s sense of fun or the ability to make others laugh.
In conclusion, the correct answer to the question “Even the loss of her jewels did not disturb the lady’s equanimity” is B. composure.