Intoxicated, Efron enters a contract for the sale of his business, Freight Dispatch, to Gretel for less than its market value. This contract is enforceable if$,$ at the time,

a$.$ Efron$$s intoxication was purely voluntary.

b$.$ Gretel was also intoxicated.

c$.$ Gretel fraudulently induced Efron to become intoxicated.

d$.$ Efron understood the legal consequences.