Which of the following sentences indicates nonlinear order? Select the best answer.

It wasn't until my friend Judah mentioned he was moving that I considered a world outside of Littleburg. All I know and love exists within the parameters of this city. One year from now, I will make a decision to jump on a plane and move across the country. Today, I am wondering if purchasing my new apartment was a mistake; maybe there's something else out there worth exploring.