During the First Few Years of This Century in the United

Multiple Choice

During the first few years of this century in the United States, how did the availability of subprime mortgages initially affect the demand for houses?  

A)  The demand for houses increased. 
B)  The demand for houses decreased. 
C)  The demand for houses stayed the same. 
D)  The demand for houses was NOT affected by subprime mortgages.