Benito orally promises Carolina that he will buy her modified 1968 Dodge Charger. For this promise to be enforceable under the doctrine of promissory estoppel,. . .
a) the Charger must be considered a customized good.
b) Carolina must act in reliance on Benito's promise to her detriment.
c) Benito's promise must have been overheard by a third party.
d) there must be written evidence of the deal.