Answer:
The line of argument which is used in this excerpt is the C: Use of pathos
Explanation:
Pathos is a kind of emotional appeal which is made to the audience to convince them using emotions like anger, surprise, sadness, disgust.
Blood Diamond is a persuasive essay which makes an emotional appeal to the audience about blood diamonds. Diamonds were called blood diamonds or conflict diamonds because they fuelled civil wars. Even though such wars have ended, conflict diamonds are still a problem. The essay mentions that both government and the jewellers are wrong in the sale of such diamonds. It describes this action as criminal.