Final answer:
According to Mary, being proud without being vain involves appreciating one's own qualities and achievements while also valuing those of others, which corresponds with option A.
Step-by-step explanation:
According to Mary, a person can be proud without being vain by possessing a strong sense of self-worth without casting others in a negative light or regarding them as inferior. This is encapsulated in option A) By having a strong sense of self-worth without belittling others.
People who are proud can take satisfaction in their personal qualities and accomplishments and have confidence in themselves. However, they can also recognize and appreciate the abilities and successes of those around them. This is in stark contrast to an egocentric personality which is characterized by an excessive focus on oneself and a neglect for others' perspectives and achievements.
The businessman feeling deserving of a raise but instead finding solace in the thought that hard work is its own reward is an example of personal pride without vanity. It reflects an internal acknowledgment of one's value and efforts without the need to diminish the work of others or seek external validation.