Answer:
C. Because it was delivered during a critical time period in history.
Churchill's speech considered historically important because it was delivered during a critical time period in history.
At the time when Churchill gave his speech, Germany was an extraordinary threat. His speech motivated the British nation to keep fighting the war that was only in its beginning and to never surrender whatever the cost. To fight in their darkest hour without hesitation to defend their native soil. Many believe that his speeches were the thing that motivated the British to go on even when the bombs were falling on their cities.
Therefore, (C) option is the correct answer.
To learn more about Churchill's speech, refer here :
https://brainly.com/question/13924559
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