Which Baroque country house in Yorkshire was designed by Sir John Vanbrugh for the 3rd Earl of Carlisle and took over a century to complete?

• A Castle Howard ✓
• B Blenheim Palace
• C Seaton Delaval Hall
• D Grimsthorpe Castle

Castle Howard, begun in 1699, was Vanbrugh's first architectural commission and remains the private residence of the Howard family to this day.