Most apartments on the upper floors of The Vista Arms apartment building have scenic views. So there is in the building at least one studio apartment with scenic views. The conclusion of the argument follows logically if which one of the following is assumed? ['Most of the apartments in the building are studio apartments.', 'Most of the apartments with scenic views are on the upper floors of the building.', 'All of the apartments on the lower floors of the building have scenic views.', 'Most of the apartments on the upper floors of the building are studio apartments.']