Dora has been in a nursing home for three years and rarely has visitors. Vanita works at the nursing home and regularly takes care of Dora. Vanita and Dora have become very close, and Dora depends on Vanita to help her with decisions about her finances. Just before Dora dies, Vanita and Dora enter into a contract to sell Dora's family home to Vanita for $20,000. The home is worth $100,000. If Dora's children try to void the contract between Vanita and Dora:

the children will not be successful in voiding the contract, because there is valid consideration and the contract is in writing.

the children may be able to void the contract based on undue influence.

the children may be able to void the contract based on fraud.

the children may be able to void the contract based on illegality.