A is corrent. The requirement is to identify the mistake that will make a contract unenforceable. A is corrent because a mutual mistake of fact typically causes a contract to be unenforceable and allows it to be rescinded. B is incorrect because unilateral mistakes generally do not make a contract unenforceable. C is incorrect because unilateral mistakes generally do not make a contract unenforceable; additionally, mistakes must be of fact, not value. D is incorrect because it states the mutual mistake is of value rather than of fact. A mutual mistake of value of the subject matter of the contract is not grounds to make a contract unenforceable.
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