One of the most effective ways governments cooperate to defeat terrorism is by?
a. signing treaties.
b. joining in military strikes.
c. creating international agreements.
d. seizing the funds of terrorist organizations.

The best way to fight terrorism is by seizing the funds of terrorist organizations. By choking the funding they would not get money to buy arms or explosives, their travel would be heavily restricted. They would not be able to recruit and maintain sleeper cells across the globe and in general they would find it very difficult to operate. Signing treaties or entering into agreements would not help much in defeating terrorism as terrorists do not respect national governments or the rule of law.