MrAnd MrsH Were Induced to Sign a Mortgage in Favour of of M

Mr.and Mrs.H were induced to sign a mortgage in favour of M Co.Ltd.by Johnston,a man living with their daughter.Johnston led them to believe that the document was an unimportant amendment to an existing mortgage,when in reality it was a second substantial mortgage of their home.Neither read the document nor questioned it.When the payments were in arrears,the mortgagee took an action for foreclosure (to take Mr.and Mrs.H's home) .Which of the following is correct with respect to the legal position of the parties?

A) Mr.and Mrs.H will likely have to honour the mortgage contract even though they didn't read it.
B) If the court finds that Johnston has committed a fraudulent misrepresentation,Mr.and Mrs.H will not have to honour the mortgage.
C) If the court finds that this is an example of undue influence by Johnston,Mr.and Mrs.H will not have to honour the mortgage.
D) If the court finds that this is an example of duress by Johnston,Mr.and Mrs.H will not have to honour the mortgage.
E) If Mr.and Mrs.H can show they didn't read the document,they will not have to honour the mortgage contract.