How did progressive and conversation republicans feel about labor unions in the early 1900s

Which situation would be considered an example of the freedom of association? a. three students write a letter to a local newspaper demanding that a teacher be fired. b. a group forms on a college campus to support a particular political candidate. c. an individual purchases a membership to a local gym. d. a religious organization buys several local lots in order to construct a new church building.

Don’t mind the already marked answer but taking it now

What were some effects in world war 1 in europe ? ( and only in europe)