Wikileaks is an organization which leaks confidential information directy to the journalists & indirectly to the public by being anonymous.
Option (B) strengthen & (D) promote can't be the answers. We can directly eliminate these 2 options.
We have to choose between option (A) disturb & (C) jeopardise .
Leaking confidential military information may pose a threat to military operations.
'jeopardize' means 'pose a threat to' or 'present a danger to'.