What aspect has O. Henry enhanced in this excerpt from "The Gift of the Magi"?

"His eyes looked strangely at Della, and there was an
expression in them that she could not understand. It filled her with fear.
It was not anger, nor surprise, nor anything she had been ready for. He
simply looked at her with that strange expression on his face."

A.
setting
B.
climax
C.
figures of speech
D.
sensory details
E.
metaphor