The repetition of the phrase "we must" in Roosevelt's speech encourages the public to act with a united front, as stated in option A and explained below.
Repetition is a device commonly used in speeches with the purpose of leaving a strong impression or emphasizing an idea. Certain words, phrases, or even sentences are repeated by the speaker to achieve such purposes.
In Roosevelt's speech, the repetition of the phrase "we must" is done in order to encourage the public to act with a united front. The focus here is on the plural "we", meaning that all should work together.
With the information above in mind, we can choose option A as the correct answer.
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