Answer:
A. The use of words such as "paradox" and "irresolute" helps establish a formal style.
Step-by-step explanation:
In the excerpt Winston Churchill describes the world leaders as soft, and not willing to do what it took to defeat Hitler or the other global threats that affected the world, it aimed to be a formal speech that expressed how frustated and let down by this was he. The words paradox and irresolute help set the formal tone of the claim and help him reach the potential audience.