Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

A) The doctrine of promissory estoppel can be used to create a new contract between parties who do not have any pre-existing relationship.
B) The decision in London Drugs Ltd v Kuehne & Nagel International Ltd requires proof that the relevant contractual clause expressly refers to the employee.
C) The decision in Central London Property Ltd v High Trees House Ltd created a new equitable doctrine that allows for the enforcement of some gratuitous promises.
D) The decision in Pao On v Lau Yiu Long stands for the proposition that a contract may exist if a person gives an implied promise to pay when requesting the provision of goods or services.
E) An equitable assignment is possibly only if the parties created a contract that is valid in equity, but not in law.