The correct interpretation of the pacing in the passage is that "The pace of the text quickens to convey the characters’ resolve to finish the windmill."
In the excerpt, the focus on the progress of the windmill despite the animals' fatigue and limited resources reflects their determination and collective effort. The quickened pace emphasizes their commitment to the project, highlighting their hope and dedication even amidst challenges. This creates a sense of momentum towards the completion of the windmill, which serves as a significant symbol within the story.