Answer:
D) A large proportion of home buyers in Southville were individuals who already owned one or more houses
Step-by-step explanation:
Bob argues that the price of houses in Southville increased because more the population, so more people equals more demand for houses, and more demand equals higher prices. But if many of the new houses were not primary residencies, then Bob's argument collapses. This would mean that the higher price for houses was not caused by fundamental factors, but is probably due to speculation.