Jane is elderly and lives in a nursing facility. She has great difficulty seeing but can manage most of her affairs. Matt, her grandson, visits Jane occasionally. Jane sometimes asks Matt to read her mail for her and to run errands for her. Matt lost his job and needs money. While reading her the mail, he tells Jane that she needs to sign a form regarding medical care Jane has received from her doctor. In reality, the paper Matt presents for Jane's signature is a check made out to Matt for $1,000. Jane cannot see the document but signs her name on the check. If the check is negotiated, which of the following is the best defense for Jane?
A. forgery.
B. lack of consideration.
C. material alteration.
D. fraud in the execution.