Which of the following uses the passive voice and puts the bad news in a subordinate clause?

We are sorry that company policy prevents giving you a full refund for your iPad.

Because you damaged the iPad by trying to repair it yourself, we are unable to give you a full refund.

The damage to your iPad is not covered by the warranty, as explained in the enclosed copy of the warranty that came with your device.

Although a full refund cannot be issued, we would be happy to repair your iPad for a nominal fee.