Which of the Following Statements Best Describes the Requirements for the Pallant

Which of the following statements best describes the requirements for the Pallant v Morgan equity?

A) There must be a binding contractual arrangement that one party would acquire property on the basis that the other party would have interests in it and that arrangement was not carried out.
B) Where the parties had entered in to an understanding between themselves to share property and the court felt it would be unconscionable to allow one party to ignore this understanding.
C) There must be a pre-acquisition arrangement or understanding that one party will acquire property on the basis that the other party will have interests in it and there was some form of detrimental reliance by the non-acquiring party, either by suffering detriment or granting the acquiring party an advantage.
D) There must be a pre-acquisition arrangement or understanding that one party will acquire property on the basis that the other party will have interests in it and there must have been some form of consideration given by the non-acquiring party for equity to intervene.