Carlie suffers from mental impairments. Carlie has not been adjudicated mentally incompetent by a court. Wendy helps take care of Carlie. An investor subsequently negotiates with Carlie for the purchase of her family farm. The investor and Carlie enter into a contract for the purchase and sale of Carlie's family farm. The contract is a. enforceable if payment in full has been made on the farm resulting in substantial performance. b. void. c. enforceable if Carlie had a lucid interval at the time of the contract. d. void only if the price is below market value.