The correct answer is option (A):
vanity
The phrase "airs and graces" refers to a display of artificial elegance, affected manners, or snobbish behavior. It implies a person is putting on a show of sophistication and superiority, often with a hint of pretension.
Looking at the options, "vanity" is the most closely related in meaning. Vanity describes excessive pride in one's appearance, accomplishments, or social status. This aligns with the idea of someone using "airs and graces" to project an image of themselves. The other options, "fairies," "servicing," and "prayers" have completely different meanings and are not at all synonymous with the intended meaning of "airs and graces".