Question

what is the main reason a speaker might use exclusive language?
to establish the speakers credibility
to highlight differences between opposing sides
to provide facts that will tap into the audiences emotions
to appeal to an audiences sense of hope

Explanation:

Exclusive language is used to distinguish between groups. It emphasizes differences. For example, using "us" vs. "them" highlights opposing sides. Establishing credibility (e.g., using credentials) is different. Providing facts for emotions (e.g., sad statistics) is about evoking feelings. Appealing to hope (e.g., positive future - oriented statements) is also a separate technique.

Answer:

to highlight differences between opposing sides