Answer:
The best thesis statement for the passage would be:
C. Later start times for students result in increased safety, not just increased school performance.
This statement encapsulates the main point of the passage, which highlights the benefits of implementing later start times for students. The passage discusses how sleep deprivation affects students' health, academic performance, and even car crash rates. By emphasizing the increased safety aspect along with improved school performance, the thesis statement accurately represents the main argument of the passage.