Mr. Robles sold his only car to Mr. Roxas for P600,000. There was no agreed date for delivery and payment. The obligation of Mr. Robles as seller is:

• A. to deliver when Mr. Roxas is ready to pay.
• B. to deliver the car immediately because there is already a perfected contract.
• C. to have the contract rescinded because no date is fixed for performance.
• D. to deliver the car immediately because his obligation is pure.