Churchill used the ethos appeal in this speech, as shown in option C.
What is ethos?
It is a rhetorical device.
It is a resource that evokes ethics and good customs.
It's a persuasive resource.
The ethos can be seen when Churchill talks about "some indication of the solid, practical grounds" as a justification for continuing the war. In this case, he reinforces how this is an ethical, correct, and moralistic attitude, influencing the public to support him.
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