Which types of appeals are most often employed in the beginning of a speech to gain the audience's interest and establish credibility

Pathos, logos, and ethos

Explanation:

In simple words,  The objective is to capture the listener 's awareness and establish confidence and the above mentioned three are the best for these.

Ethos can be understood as an ethical appeal that is used to persuade somebody of that persuader's integrity or reliability. Pathos is indeed an emotional response that is used to persuade an audience of a point of view by eliciting an emotional reaction. The appeal to logic, or logos, is a method of convincing an audiences through reason.

that is literally a whole assignment and i'm not sure anyone in their right mind or even wrong mind is going to do an entire assignment for someone just for 100 points on a website. sorry to tell you like

i believe it is the first choice (1.)

because the major theme is(“both the wild and civilization have rules.”)

and also as u said,( based on what buck learns within the call of the wild, "both the wild and civilization have rules".this is true of humans within society as well.