You can stay in the flat for free as long as you pay the bills.

Question:

You can stay in the flat for free as long as you pay the bills.

• A.
  Whether you pay the bills or stay in the flat, it is free.
• B.
  Without the bills paid, you can stay in the free flat.
• C.
  Unless the flat is free of bills, you cannot stay in it.
• D.
  Provided you pay the bills, you can stay in the flat for free.