According to the Book, the U

According to the book, the U.S. housing market collapsed when:

A) Too many subprime loans defaulted
B) Credit rating agencies rated risky investment loans as "low risk" for default
C) Mortgage brokers and banks approved subprime and risky loans to unqualified applicants
D) Banks sold subprime loans on the secondary market in order to make a profit
E) All of the above
F) None of the above