(a) That's wrong. 

You were asked to select the most accurate answer.

The most accurate answer is: Only if a written promise meets the requirements of what is called a ‘deed’ will the promise be sufficiently ‘formal’ to be legally enforceable even if no consideration is given in exchange when the promise is made.  A deed is a written document that identifies itself as a deed and which is signed and sealed and a copy delivered to each of the parties.

Give yourself no marks for this answer.

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