Rachel has been asked to contribute a brief video describing her summer as an engineering intern with the city's electric power company for her high school career counseling center.

Read this excerpt from the draft of Rachel's introduction and answer the question.

When did you first dream of your future—your future beyond high school? For me, it began with the inspiration I received from a sixth-grade teacher who introduced me to a special word, “engineering.” While I knew of transportation engineers—who hasn't heard of a train engineer?—I had never thought about exploring other areas in the field of engineering. My teacher had become a mentor in the Sally Ride Science Academy with her sponsorship, she encouraged me to attend a Science Festival with my parents. By sponsoring my attendance at that event, I was able to begin a journey toward my recent summer internship with CPS Energy's SAFE program.

Which sentence most closely states Rachel's thesis?

When did you first dream of your future—your future beyond high school?
For me, it began with the inspiration I received from a sixth-grade teacher who introduced me to a special word, “engineering.”
While I knew of transportation engineers—who hasn't heard of a train engineer?—I had never thought about exploring other areas in the field of engineering.
My teacher had become a mentor in the Sally Ride Science Academy with her sponsorship, she encouraged me to attend a Science Festival with my parents.