Twain writes "The Notorious Jumping Frog of Calaveras County" as a story within a story. What is the effect of this technique?

The events in the outer story shape what happens in the inner story.

The outer story explains how a stranger tricks Jim Smiley, while the inner story explains how the narrator's friend plots with
Wheeler to play a joke on the narrator.

Readers understand how the characters in the outer and inner stories resolve the main conflict differently.

The outer story describes what happens between the narrator and Simon Wheeler, while the inner story relates Wheeler's
tale about Jim Smiley and the jumping frog.