One of the most effective ways governments cooperate to defeat terrorism is by

signing treaties.
joining in military strikes.
creating international agreements.
seizing the funds of terrorist organizations.

One of the most effective ways governments cooperate to defeat terrorism is by seizing the funds of terrorist organizations. The correct option among all the options that are given in the question is the last option or the fourth option. Without funds, the terrorists would be unable to fund their destructive activities around the globe.

D, just took the test

C) Does not have to be photographed