Final answer:
Churchill and Roosevelt used metaphors, similes, and parallel structure in their speeches to develop central ideas and engage the audience. Option A, B and C are the correct answers.
Step-by-step explanation:
Both Churchill and Roosevelt used various rhetorical strategies in their speeches to develop the central idea or purpose. Two common rhetorical devices they employed were metaphors and similes. A metaphor compares two things by saying they are the same, while a simile uses the words "like" or "as." Both authors used these devices to create vivid imagery and make their ideas more relatable to the audience.
Additionally, both Churchill and Roosevelt utilized parallel structure as a rhetorical device. This involves repeating the same pattern of words to show that ideas are equally significant. Parallel structure helps organize thoughts and makes statements more memorable. An example of parallel structure in Churchill's speech is the famous line: "I have nothing to offer but blood, toil, tears, and sweat." Roosevelt also used parallel structure in his speech when he said: "...first we are determined that before the sun sets on this terrible struggle, our flag will be recognized throughout the world as a symbol of freedom on the one hand, and of overwhelming force on the other."
In conclusion, both Churchill and Roosevelt employed metaphors, similes, and parallel structure in their speeches to develop the central ideas and engage the audience.