A Group of Young Adults, Males and Females, Decides to Spend

A group of young adults, males and females, decides to spend the weekend on a houseboat on the lake. Saturday is spent swimming, eating, and drinking. The drinking continues late into the night. Bill, Joan, and a few others engage in a drinking game, seeing who can drink a six-pack of beer in the shortest amount of time. Surprisingly, Joan has the shortest time. Soon after, the group notices that Joan has fallen asleep. She doesn't respond when Bill attempts to awaken her so that she can go to bed. Meanwhile, two individuals who did not participate in the drinking game but who have been drinking are feeling warm and decide to cool off in the lake. Although they laugh when someone expresses concern about them getting into the water, they do agree to put on life jackets and to stay within the boundaries of the boat's spotlight. Which one of the following poses the greatest risk for the individuals getting into the lake

A) becoming hypothermic (extreme low body temperature)
B) developing cardiac myopathy
C) developing pneumonia
D) developing severe stomach cramps