Which of the Following Situations Appears to Involve 'Duress

Which of the following situations appears to involve 'duress'?

A) A property developer promised their accountant a share in a business venture in return for a reduction in their bill.
B) A woman gave all of her property to the religious order of which she was a member.
C) A man induced another to sign a contract by telling him that if he did not,he would report his son to the police for committing a criminal offence.
D) An elderly Italian couple sign a mortgage in favour of a Bank guaranteeing their son's debts;the Bank manager knows the couple are unaware of the son's financial difficulties.