C. To replace the password system.

C. 更换密码系统。

If Apple writes a new piece of software that could circumvent its password systems on one phone, that software could fall into the hands of hackers and be modified to unlock other devices.

如果苹果写了一个新的软件，能够规避一部手机的口令系统，那么软件就能落入黑客手中，被他修改并解锁其他设备。