Which of the Following Was the Result in Cooper Investments

Which of the following was the result in Cooper Investments v.Conger,the case in the text in which guarantors of a note claimed that they were not liable because the terms of the note had been altered without their consent?

A) That the guarantors consented by implication and remained liable.
B) That the guarantors failed to file a financing statement evidencing their position and that they, therefore, retained liability.
C) That the alterations should discharge the guarantors from liability on the note.
D) That the alterations should discharge the guarantors, but only for 50% of the obligation on the note.
E) That the alterations were commercially reasonable and that, therefore, the guarantors remained liable.