What emotion most likely causes Ismene to want join Antigone in

The emotion that most likely causes Ismene to want to join Antigone in defying Creon's edict and burying their brother Polyneices is guilt. Ismene feels guilty for not doing her part to honor their brother and for leaving Antigone to face the consequences alone. She also realizes that by disobeying Creon, she is risking her own life, but she is willing to do so because she feels it is the right thing to do.