3).Economics is primarily the study of __ A) the different types of governments and the impact of their policies on a nation B) agents' choices and their impact on society () the relationship between matter and its motion D) events of the past and how these events affect present human behavior

## Step 1<br />The question is asking us to identify the primary focus of study in Economics. <br /><br />## Step 2<br />Option A suggests that Economics is primarily about the study of different types of governments and their impact on a nation. While this is a part of Economics, it is not the primary focus.<br /><br />## Step 3<br />Option B suggests that Economics is primarily about the study of agents' choices and their impact on society. This is indeed the core of Economics. Economists study how individuals, businesses, and governments make choices and how these choices affect the allocation of resources and the overall economy.<br /><br />## Step 4<br />Option C suggests that Economics is primarily about the study of the relationship between matter and its motion. This is more related to Physics, not Economics.<br /><br />## Step 5<br />Option D suggests that Economics is primarily about the study of events of the past and how these events affect present human behavior. This is more related to History, not Economics.