Dennis will purchase his mother's house if his mother allows him to purchase the house. Dennis's mother will attend the wedding only if Dennis invites her. Dennis's mother would not let him move to Miami and buy her house too. Dennis will get married only if he is able to purchase his mother's house.
Dennis will either purchase his mother' s house and live in San Diego, or else he will move to Miami, but Dennis will not do either of these unless he gets married. Dennis' s mother will let Dennis purchase her house only if she attends his wedding, but not otherwise. Ttherefore, Dennis will purchase his mother' s house and live in San Diego only if his mother attends his wedding.
Which one of the following, if assumed, allows the conclusion above to be properly drawn?