The GFC Has Greatly Reduced the Amount of MBSs Issued

The GFC has greatly reduced the amount of MBSs issued in the Australian bond market because:

A) it became apparent that Australian MBSs did not deserve their high rating
B) of high levels of non-performing loans
C) of the weakness of the Australian economy
D) these securities funded non-performing loans in the US
E) of the loss of investor interest in MBSs resulting from the losses incurred on US MBSs.