This American poster was created during World War I. It shows the devil sitting with Kaiser Wilhelm II, the
emperor of Germany. They are discussing the sinking of the British passenger ship Lusitania in 1915, which
killed nearly 1,200 passengers, including 128 Americans. Explain how this poster demonstrates bias. Explain that the bias is and how it can be identified ?

This obviously not made by the Germans themselves. The Americans were probably angered by the death of their citizens and made this poster to demonize the Kaiser Wilhelm II ( literally in this case).  

Explanation: To identify bias you have to look at the creator/ writer. What is the context behind this picture? Look at the "good" and "bad" side, ( well everyone thinks their side is good and the other side is bad) What did the "good" side and "bad" side say/portray?

the statement the greek philosophers aristotle and plato would be most likely to agree with is statement c, a countries leader should be motivated by the common good of the country.

polling is a process and the outcome is not involved in the process itself.

the outcome, which is an unfavorable rating for a particular candidate is not affected by the mechanical process of polling.

it rather depends on the number of people voting in favor of the candidate.

this is an outcome of people's preferences.