Alec and Kim Used to Be Much Better Friends Than

Multiple Choice

Alec and Kim used to be much better friends than they are now.The problem is what to do about Christmas gifts? If they wait until Christmas morning and move simultaneously, their payoff matrix is If Alec commits at Thanksgiving time not to buy a gift for Kim, Kim will find it in her best interest

A) to buy a gift for Alec to spite him.
B) not to buy a gift for Alec.
C) to buy a gift for Alec with probability 2/7.
D) to buy a gift for Alec with probability 4/9.
E) to buy a gift for Alec with probability 4/6.