Translation:What is the budget for this advertisement?
In the last example you accepted only "cost of this aavertisement", now you insist "budget for" --> this is totaly confusing and incosequent! Please add all missing correct answers!
Actually, throughout the lesson "cost" was translated as 费用 and "budget" as 预算. Let's not criticize the Chinese lessons in the rare instances where they are perfectly consistent.