Which weapon did Sigurd use kill the dragon guarding Andvari's gold?
A. a sword made from the broken pieces of his mother's magical sword
B. a sword made from the broken pieces of his father's magical sword
.C. a sword made from the broken pieces of Odin's magical sword
.D. a sword made from the broken pieces of Regin's magical sword
E. a sword made from the broken pieces of Fafnir's magical sword