The answer is B. The rising sun is always a symbol of hope for a new beggining.
I would say that the sense of urgency would be for warning that Hitler had a plan to invade Britain since such an event would be extremely serious and would require all the armed force to be marshalled to prevent this and to fight the Nazis in the air, on the ground and at sea to repel them and show the resolve of the people of Britain.
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Thanks broski! XD Have a good day! :)
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