user: Question: What were the options that were Completed before the 4 th task that had viewers selecting Nan?
Columns: ['Task No.', 'Day announced', 'Options', "Viewers' selection", 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Day 43 (May 4, 2008)', 'Alex, Ejay, Josef, Nan, and Robi', 'Josef', 'Completed']
SQL:

assistant: SELECT "Options" FROM "Table" WHERE "Result" = 'Completed' AND "Task No." < 4.0 AND "Viewers' selection" = 'Nan';