There are different kinds of poster. The appeal are used in the poster is to "persuasion". The poster aim to influence or convince the soldiers to carry out their duties without any disturbance or noise.
There are different kinds of appeals in persuasion. They are;
Pathos is known to be as an appeal to emotions. This is because, it aim too persuade one's audience by appealing to their feelings.
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The answer is -4 while the element is chlorine
I'm pretty sure the answer is either A or D