In which of the following resides the irony in the short stories “The Gift of the Magi” and “The Necklace?"

A. The protagonists value objects more than people.
B. The protagonists want to escape their low social status.
C. The protagonists struggle for something that proves to be useless.
D. The protagonists learn to value hard work and loyalty instead of wealth.

C. The protagonists struggle for something that proves to be useless.

The irony in the short stories "The Gift of the Magi" and "The Necklace" resides in option C: the protagonists struggle for something that proves to be useless. In both stories, the main characters go to great lengths and make sacrifices to obtain a prized possession or status symbol, only to realize that their efforts were in vain or that the object they coveted was not as valuable as they initially thought.