c) The poster directly reminds civilians how they can contribute to the war effort, but the speech does not.
Explanation:
The poster directly tells the civilians that even though they might not involved in the battlefield, they still an contribute to the war by providing the soldiers with food supplies.
All of these claims he makes about oppressing East Asian trade are reasons to fight against European powers. He believes that war will reduce their influence in Asia and is the best course of action.