When Burt purchased Sweetacre, he financed the purchase through a mortgage on the property held by First Bank. The mortgage contained a "due-on-sale clause," requiring the mortgagor to pay off the mortgage at the time the property is sold. Burt made all of his mortgage payments in a timely manner. Five years after Burt purchased Sweetacre, he sold the property to Tully. Burt told Tully that there was a mortgage on the property but he did not mention the due-on-sale clause. Tully paid Burt the asking price for Sweetacre. Burt pocketed the proceeds without paying off the First Bank mortgage. Which of the following best states the effect of the due-on-sale clause on Tully's interest in Sweetacre?
A. First Bank can foreclose on Sweetacre.
B. Tully must agree to assume the First Bank Mortgage on Sweetacre.
C. The only effect of the clause is that Tully is personally liable on the mortgage.
D. The clause has no effect, because due-on- sale clauses are generally void as contrary to public policy. 
Choose A, B, C or D as your solution.
A