Which of the Following Searches Should Be Considered Constitutional

Which of the following searches should be considered constitutional?

A) A wife consents to search of her and her husband's entire home, even though he is not present; police search the entire home
B) A wife consents to a search of her home although her husband, who is present, denies consent; police search the living room and then leave
C) A roommate consents to a search of his dorm room, even though the other occupant is not there; police search the entire room, including both roommates' desks
D) None of the above searches are constitutional.