In a group discussion, which sentence is most clearly challenging the credibility of a source?
a. piracy is a sensitive issue, and it's unfortunate that peterson's book about it has been republished recently.
b. peterson's goal was to tell a story, not argue a point, so his opinions aren't really that important.
c. although peterson's comments may have been valid at one time, his book is over 30 years old.
d. when peterson calls the ship the ransom, he's clearly making a reference to modern piracy.

samuel gompers was an extremely important person in the american labor movement, being him an employee all his life he devoted himself to fight for the rights of his pairs, he believed they all had the right to have better thing and that they all were working for them but the factory workers were greedy, ambitions and socialist people for him who he didn't have a good concept of.

he gave so many speeches and led so many strikes and protest to fight for equality which he considered employers didn't want to accept, so he had an absolutely negative opinion of them.

the answer is irony!