According to the Common Law, Which of the Following Would

According to the common law, which of the following would make a written contract incomplete?

A) The words need not appear in a formal document so long as it is signed by both the parties.
B) The essential terms of promises to be performed must be written out; all details need not be.
C) If an essential term is missing, it cannot be enforced, unless it can be inferred by rule of law.
D) The parties must be named in the writing in a manner sufficient to identify them.
E) The consideration for the promise need not be stated in writing, even if it has already been given.