What is the purpose of a boycott? A. Enhance efficiency
B. Punish unfair practices
O c. Promote sustainable development
O D. Increase profits

B. Punish Unfair Practices

Explanation:

To boycott something is to not use it's products or just to simply not use it. You would do this because it has unfair treatment or the quality is low. So basically the reason for a boycott is to "punish" unfair practices.

a.

congress passed laws allowing for free passage between states.

geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to