user: Question: What class has a capacity smaller than 3384 for Ferguson?
Columns: ['Driver', 'Navigator', 'Vehicle', 'Class', 'Capacity', 'Total Time', 'Margin']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Broadbent', 'Lilleyman', '1974 Porsche 911 Carrera RS', '5C3E', 3384.0, '17:22', '00:00']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Capacity" < 3384.0 AND "Navigator" = 'Ferguson';