Which could best serve as the theme of the story the gift of the magi

Although the options are not included in this question, one of the ideas that could best serve as a theme in the story "The Gift of the Magi" is that of self-sacrifice. In this story, both Della and Jim sacrifice something that they really value in order to give a gift to the other one. More importantly, this gift is not important because of its material worth but because it is a sign of their love for each other. O. Henry conveys the idea that true love is impossible without some sacrifice.

we need the passage first