The line of dialogue that best helps the audience to understand Eugene's perspective is:
Let's understand what a dialogue is.
Dialogue refers to the conversation that takes place between two or more people. It is used in dramas. It is a literary technique which writers employ to engage two or more characters in a conversation with each other.
Another form of dialogue is seen when people meet to settle disputes or disagreement. It is utilized in order for people to understand themselves.
Thus, from the given passage, option A is the best that makes the audience to understand Eugene's perspective.
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