Sarah Agrees with Her Sister Anna That If She Wins

Sarah agrees with her sister Anna that if she wins the lottery this week, she will share the prize with her. In exchange, Anna makes dinner that night. Which of the following statements is TRUE?

A) This is a contract, and there is a presumption that parties to a contract intend to be bound by it.
B) Because this is a contract between family members, there is also a contrary presumption that the parties did not intend to be bound.
C) If Sarah wins the lottery and refuses to give Anna half, Anna will have to show that a reasonable person in her position would have believed that Sarah intended to be bound by her promise.
D) Both A and C
E) All of the above