Read the scenario and then choose your answer from one of the available options below: 

Yolandi loves jewellery. One day she sees Sarah wearing the most beautiful golden necklace and she decides she simply has to have it right then and there! Yolandi offers to buy it from Sarah, but Sarah tells her that the necklace belonged to her grandmother and has much sentimental value to her; she cannot bear to ever part with it. Yolandi, who has a lot of money and is used to getting what she wants, gets very angry and pulls out a little silver dagger that she always wears with her. She grabs Sarah’s arm and threatens to injure her if Sarah doesn’t sell her the necklace. Frightened and very upset, Sarah agrees to sell the necklace to Yolandi for R200. 

Which one of the following best describes the outcome of this contract?