Mary is the care-taker of Anne, an elderly lady, who relies on Mary for her daily care.Mary asks Anne to co-sign a contract for Mary to buy a car.Mary tells Anne that if Anne does not co-sign, Mary will have to quit her job caring for Anne.This is in fact not true and Mary is planning on leaving Anne on the hook for the cost of the car under the contract.Anne would be able to defend against this contract under what theory

a. mistake

b. undue influence

c. lack of capacity

d. all of the above