Answer:
The thesis statement in this excerpt is There is no one reason why good kids go bad, but there are typical reasons.
Step-by-step explanation:
The thesis statement is a sentence that presents the main idea of an investigation or any kind of paper, it makes a claim that directly answers a question, the sentence number 5 is directly answering the question that is stated inline 2 which leads to the main topic as a foundation for the research paper.