Cassandra lived the last ten years of her life in her niece Angelica's house, under her care. After Cassandra's death, her children discovered that she had sold her house a week prior to her death to Angelica for $50,000. The market value of the house at the time of the sale was $500,000. Cassandra's children may attempt to have the sale set aside, arguing that it was the product of: Multiple Choice duress fraud mutual mistake undue influence