How did labor unions react to economic conditions after World War I?

They used the recession as an opportunity to recruit more union members.

They benefited from laws that guaranteed unions could use collective bargaining.

After seeing what life was like for soldiers, they realized their pay and working conditions were good.

After years of cooperating with the war effort, they fought harder for better pay and working conditions.

Question

How did labor unions react to economic conditions after World War I? 

 They used the recession as an opportunity to recruit more union members. 

 They benefited from laws that guaranteed unions could use collective bargaining. 

 After seeing what life was like for soldiers, they realized their pay and working conditions were good. 

 After years of cooperating with the war effort, they fought harder for better pay and working conditions.

anonymous · Answer

I'd probably go with after years of cooperating with the war effort, they fought harder for better pay and working conditions. This is actually true, but it would be many years before they would get what they wanted.

The other answers don't seem to fit. Collective bargaining suffered after WW1, they didn't necessarily realize that their pay and lifestyle were "better" compared to soldiers, and the recession actually hurt them. Most of this was due to the huge number of soldiers flowing back into the economy and taking up whatever jobs were available -- union or not.