Answer:
Della sells her hair so that she can buy a chain for her husband's pocket watch. She is motivated to do this by her love for her husband, Jim, and her desire to buy him a special Christmas gift.
Explanation:
As a newlywed couple, Jim and Della struggle financially. Jim works hard to maintain his modest household, and Della appreciates all that he does for the two of them. As Christmas approaches, Della wants to buy a special gift for her husband. She has managed to save only $1.87, and she needs much more to buy the chain for his pocket watch. To get the extra money, she sells her greatest asset, her hair.