Ted Nix Purchased Two Acres of Land from Sally Pine

Ted Nix purchased two acres of land from Sally Pine.Nix paid 15 percent at the closing and gave his note for the balance secured by a 30-year mortgage.Five years later,Nix found it increasingly difficult to make payments on the note and finally defaulted.Pine threatened to accelerate the loan and foreclose if Nix continued in default.Pine told Nix either to get the money or obtain an acceptable third party to assume the obligation.Nix offered the land to Quick Co.for $4,000 less than the equity Nix had in the property.This was acceptable to Pine and at the closing,Quick paid the arrearage,executed a new mortgage and note,and had title transferred to its name.Pine surrendered Nix's note and mortgage to him.The transaction in question is a(n) :

A) third-party beneficiary contract.
B) novation.
C) purchase of land subject to a mortgage.
D) assignment and delegation.