When you force someone to enter into a contract based on fear that you create because you threaten that person, this is known as:

a. consent.

b. unjustifiable reliance.

c. collateralism.

d. duress.

The correct answer is: d. duress.

Duress is known as threats, violence, illegal constrains or other actions used to force a person to do something against their will. "their confessions were done under duress."

The correct answer would be option d. Since duress is known as forcing a person to do something, in the majority of the cases, this person is completely against of what they have to do. Therefore, these types of threats are totally against the capacity of autonomy of the person, in that sense, it is really difficult that they can build up resistance to what they are asked to do.