Which of the following is most likely to constitute undue influence?

Grabbing someone's hand and forcing him or her to sign on a contract you have prepared.

A firm demanding more in terms of pricing by withholding essential supplies.

Threatening to commence a frivolous criminal prosecution against someone, in order to get him or her to contract with you.

A clergyman using a parishioner's emotional susceptibility to get the parishioner to contract with the clergyman