Answer:
No enforceable contract.
Step-by-step explanation:
In this example, Steven and Marvin had already reached an agreement that was benefitial to Marvin. He was going to be able to drive across Steven's land. However, Steven later changed his mind. The fact that Marvin has no enforceable contract means that he will not be able to prove that Steven had given him this privilege. In turn, this means that he will not be able to force Steven to give him access again.