Which of the following sets the events of the plot in motion? a. mr. loisel's inability to find the lost necklace b. matilda's poor luck to be born in a class below her beauty c. mrs. forestier's insistence that matilda return the necklace quickly d. matilda's desire to be "better" than she is, and part of a higher class

D. Matilda's desire to be "better" than she is, and part of a higher class.

Explanation:

The fact that Matilda was born in a class below her beauty is not necessarily a problem, as many people would be able to be happy under these conditions. However, the real problem is the fact that Matilda wants to be part of a higher, richer class. This causes dissatisfaction within herself. The situation is the one that sets the events of the plot in motion, as it is the reason why Matilda decides to borrow the fancy necklace.