PART B: Which detail about the narrator helps
develop the theme from Part A?

Hello. You forgot to talk about what the question is about in Part A.

The question in Part A asked what was the theme in "The trip of le horla". The theme is "Unusual experiences can cause unexpected wonderment at a familiar world. "

A. his excitement about the unpredictability of the balloon's path

Explanation:

"The trip of le horla" is an account by author Guy de Mauppassant about the day he and some friends took a balloon ride.

The author relates this moment with great impetus and shows that this was a totally unexpected situation, but that it gave him a unique experience, in addition to providing that he and his companions could admire the world already known in another way, from another perspective. This can be seen by the narrator's excitement at the unpredictability of the balloon path.