I dont know which answer is correct plz help me

One common educational practice is to chart students' progress over time so that students can see their own improvement. these progress charts often lead to higher student achievement in the absence of other observable forms of reinforcement. the effectiveness of such charts in changing behavior illustrates the role of reinforcement as:

A. in weeks v. united states (1914), the court established the exclusionary rule, which was incorporated to the states in mapp v. ohio (1961), and the court established the concept of a "good faith exception" to the exclusionary rule in united states v. leon (1984). in their opinion, the supreme court pointed out that compliance with the exclusionary rule can have a cost to society (criminals can go free) that outweighs the benefits (stopping illegal searches by police). ultimately, the court determined that despite the exclusionary rule, evidence can still be admitted in situations where police made genuine "good faith" efforts to act legally, but technically acted illegally, in obtaining the evidence. explain the exclusionary rule good faith exception and explain and support whether you agree or disagree with the concept of a good faith exception to the exclusionary rule? why or why not? use the lesson notes and/or one news source to support your answer.

What is it called when countries build lots of weapons to store and them in case of a war?