What is the legal effect of a mutual mistake of value?

A$.$ the contract is not legally enforceable

B$.$ the contract may be enforced by the offeror, but not by the offeree

C$.$ the contract may be enforced by the offeree, but not by the offeror

D$.$ the same as the legal effect of a mutual mistake of material fact

E$.$ the contract remains enforceable by either party