Which of the Following Is Not a Situation in Which

Which of the following is not a situation in which a constructive trust may be employed?

A) To allow an interest to bind a purchaser of registered land where the purchaser's conduct reveals acceptance of the defendant's particular interest, such as through paying a lower purchase price for the property, even though the interest is not protected by entry on the register.
B) To give the purchaser an immediate entitlement in equity to property sold under a specifically enforceable contract.
C) To found an interest in the family home whenever justice and good conscience require it.
D) To enforce mutual wills against the survivor of a commonly executed will.