Jon Weinstein Has a Contract to Purchase Ralph Heap's Medical

Jon Weinstein has a contract to purchase Ralph Heap's medical office building. After the closing, Jon learned that Ralph already had another contract with Dennis Highsmith for the sale of the building. Which of the following is correct?

A) Ralph did not deliver marketable title to Jon and he can rescind the contract and seek damages.
B) It is Jon's responsibility to determine whether there are any other contracts for the sale of the building.
C) Jon's remedy is with the title company and not Ralph.
D) Jon will have to file suit against Ralph's other buyer in order to obtain damages.