Word choice is an important feature when a text is being written or spoken, since it can affect the tone, clarity and final impression of the audience. A proper analysis of the correct word choice should take into considerations a lot of factors, but pronunciation is not one of them. The pronunciation is independent of the word choice, the way words are spoken is not affected by which and how words are used in a text.
You determine if the evidence is relevant and if it directly answers the writing prompt when writing your essay by seeing if any quotes are relevant to the question or explains or possibly gives any background.