In Which of the Following Circumstances Will an Original Mortgagor,who

In which of the following circumstances will an original mortgagor,who has allowed its mortgage to be assumed by a new buyer,be held liable under the assumed mortgage?

A) if there is a deficiency in assigned insurance proceeds
B) if the original mortgagor agrees to pay a penalty for lost interest
C) if the new buyer defaults under the terms of the mortgage
D) if the lending bank assigned the mortgage to another financial entity