What are the interests in Brownacre if Edward owns a fee simple absolute in Brownacre and conveys the property "to Robert and his heirs, but if Robert sells liquor on the land, then to Ruth and her heirs"?

Select one:a. Robert owns a fee simple defeasible, and Ruth owns a future interest.b. Ruth owns a fee simple absolute.c. Robert owns a fee simple defeasible.d. Ruth owns a fee simple defeasible and Edward owns a future interest.