What compels characters or real people to set off on a journey—physical, mental, or spiritual—and what do they learn from their experiences?

you!

Our intentions, goals and perception of the world drives us to have a need to accomplish a goal.

Explanation:

a. the scene is structured as a dialogue between two characters in their own informal language.

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.