Final answer:
Mr. Green's conditional agreement to drive Ms. White to the airport lacks sufficient consideration because he is not legally obligated to perform the service, hence it does not create a valid contract. The correct answer is 'a. True'.
Step-by-step explanation:
The student's question refers to the elements required to form a valid contract, specifically focusing on the concept of consideration. In the scenario provided, Mr. Green's agreement to drive Ms. White to the airport for $20 is contingent on whether he 'feels like it,' making his performance entirely optional.
For there to be sufficient consideration, both parties must have a legal obligation to perform. In this case, Mr. Green has not committed to anything since he can choose not to perform the service without breaching the agreement. Hence, the consideration is not sufficient because his promise is illusory—it lacks the necessary element of commitment.
Therefore, the answer to this question is 'a. True,' Mr. Green has failed to give sufficient consideration to create a contract with Ms. White.