Final answer:
Della sells her hair to buy her husband a Christmas gift, showing she is selfless and values her relationship over material possessions.
Step-by-step explanation:
The character Della's decision to sell her hair to buy a Christmas present for her husband indicates that she is selfless and willing to make personal sacrifices for the ones she loves. This act demonstrates her deep love and commitment to her relationship, rather than a focus on materialism or superficial values. Selling something as personal as her hair, which is often considered an important aspect of one's appearance, especially during the time period in which the story takes place, underscores the extent she is willing to go to in order to provide a meaningful gift for her husband. Della's actions speak to the themes of sacrifice and love that are central to the story's message.