Benson Tells His Son,Charles,that He Will Sell Him His Bentley

Benson tells his son,Charles,that he will sell him his Bentley for $200 when he turns 18.On his 18ᵗʰ birthday,Charles brings his father $200,but Benson refuses to hand over the keys,arguing that,no matter what he said,a Bentley is worth more than $200.Which of the following statements is true?

A) The contract was never made because there wasn't adequate consideration.
B) The contract was never made because any agreement between relatives is just a gratuitous promise.
C) The contract was created because the consideration is sufficient.
D) The peppercorn theory allows Benson to demand any amount for the Bentley even though he offered it for $200.
E) The contract was never created because there was never an exchange of value.