Okay, first of all, the transaction is still unconfirmed, so it's normal that you don't have access to your money yet. The reason is that some of the previous related transaction weren't confirmed because of their low priority, like this one:
https://blockchain.info/fr/tx/a2c9b4d169150c565ba67865caf4ef998f2276eb588c5e9001b4180456613264(it was made 8 hours ago and will be confirmed in 6 blocks because it's medium priority)
I would advise to still wait a couple of hours, and if you have the private key of the address C, you're good.
P.S. You should take seriously the advice about using a 2-factor authentification for your own security, even if your account was probably not hacked.