Question

which best defines counterterrorism?
an attempt by governments to identify terrorists
the use of political tactics to prevent terrorist attacks
the application of military force to retaliate for terrorist attacks
an agreement by organizations to limit weapons sales to terrorists

Explanation:

Counterterrorism involves measures to prevent terrorist attacks. Political tactics are a key part of counterterrorism efforts, such as intelligence - sharing, policy - making to address root causes (which can be political in nature like addressing grievances that might lead to radicalization), and diplomatic efforts to isolate terrorist groups politically. Identifying terrorists is just one part of a larger counterterrorism strategy. Military retaliation is more of a response after an attack rather than a preventive counterterrorism measure. Limiting weapons sales is a narrower aspect and not the best overall definition.

Answer:

the use of political tactics to prevent terrorist attacks