Which of the following have capacity to enter into a contract, based on the information given? Assume no other facts.

1.Andrea is a 16-year-old who, with the consent of her parents, recently married her 18-year-old boyfriend who is a legal adult.

2.Ed is 54 years old and has been diagnosed with early-onset Alzheimer's. His illness is well documented. However, he still lives at home with his wife, despite a number of recent decisions that indicate he is no longer mentally competent.

3.Abby is 21 years old and lives in a group home for disabled adults. She has not been adjudicated a disabled adult, but she has always resided in an institutional setting.

4.Carlos is 27 years old. He has a driver's license and works at a full-time job. However, he is developmentally challenged and at age 18 his parents were declared his legal guardians.

5.George is a 48-year-old physician who suffers from end-stage cancer. He lives with his family and is still generally able to communicate clearly. However, he is taking high levels of morphine to control the pain associated with his disease. His wife is his legal guardian with respect to his medical care.

6.Jack is 16 and has already started a business delivering flyers from various businesses to homes in the neighborhood. Business is so good that he enters into a contract with Ace Motors to buy a used SUV for $7500. Jack is to make a payment of $250 per month. After six months, Jack stops making payments.