Kailen Is a Huge Fan of Justin Bieber

Kailen is a huge fan of Justin Bieber. She pays him $140.00 to purchase his hair clippings from a recent haircut. Which statement is correct according to contract law?

A) Kailen's agreement will be evaluated by the courts to determine if it was wise before courts will enforce it.
B) Under the theory of freedom to contract, the courts will support the rights of the individual to contact and not interfere.
C) Under the theory of freedom to contract, the courts will support the agreement if it is in writing.
D) Under the theory of good faith and fair dealings, the court will support the agreement as long as they determine that Justin Bieber did not take advantage of Kailen.