Read this excerpt from "The Gift of the Magi" and answer the question.

His eyes were fixed upon Della, and there was an expression in them that she could not read, and it terrified her. It was not anger, nor surprise, nor disapproval, nor horror, nor any of the sentiments that she had been prepared for. He simply stared at her fixedly with that peculiar expression on his face.

What does Jim’s reaction signify?
1)an event that Della should have anticipated
2)a problem that Jim is afraid to confide to Della
3)the possibility of an unusual revelation for Della
4)the realization that Jim lacks a gift for Della