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B is corrent because the existence of consideration requires that there be mutuality of consideration (i.e., that each party is bound to give consideration in exchange for the consideration being given by the other party to the contract).
A is incorrect because the courts generally do not look into the adequacy of consideration (sufficient monetary value) so long as the consideration is legally sufficient.
A is incorrect because the courts generally do not look into the adequacy of consideration (sufficient monetary value) so long as the consideration is legally sufficient.
D is incorrect because the courts do not look to whether the consideration conforms to the subjective intent of the parties. The agreement is viewed objectively, not subjectively.