I believe that the best answer to the question: Which is the best source to use to confirm the information in this excerpt, would be: C: a website providing a timeline of Ford´s life.
Explanation:
The reason is that a timeline is used as a means to plot, within time, events that were important on the history of a place, or a person, in chronological order. Because this bit of information relates the timeframe of Ford´s childhood moments, the best place to read about this particular event in Ford´s life would be on a timeline, and not any other source.
