Answer:
The correct answer is C) This is Twain's thesis and serves to introduce all claims that follow.
Explanation:
The theme of Twain's "The Turning Point in My Life" and his claims in that essay revolve around the importance of Caesar's crossing of the Rubicon as a turning point in history and its implications. He uses this comparisons to point out the importance of certain events that become life-changing turning points that can change history and have far reaching implications like Caesar's crossing.