The sentence that states a central idea in the section title "A Baby Step into the Future" is "The autonomous A7 represents one of the biggest steps forward..."
The term central idea is used to refer to the most important topic or message behind a literary work. Some texts can contain more than just one central idea. In some cases, they are divided into different sections, so as to better develop each of those central ideas.
That is the case with the text “I Rode 500 Miles in a Self-Driving Car,” in which we can find the section "A Baby Step into the Future." The central idea of this section is that the autonomous A7, a self-driving car, is one of the biggest steps ever taken by automakers.
With the information above in mind, we can select option C as the correct answer for this question.
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