Final answer:
Owner B has already granted the easement, allowing Owner A to access the nearby highway.
Step-by-step explanation:
An easement is a right to use the property of another for a specific purpose. In this case, Owner A needs an easement from Owner B to access the nearby highway.
The fact that Owner B agrees means that Option 4: Owner B agrees to grant the easement is true. This means that Owner B has already granted the easement, allowing Owner A to have the right to use their property to access the highway.