Which sentence in the introduction is the thesis statement?

Without the reaction of the community, a person might notice positive and negative effects on people involved in sports activities.

I apologize, but I would need to see the introduction or have some context in order to identify the thesis statement.

To determine which sentence in the introduction is the thesis statement, we first need to understand what a thesis statement is. A thesis statement is a concise summary of the main point or claim of an essay or research paper. It provides the reader with a clear idea of what the paper will discuss or argue.

Now, let's examine the introduction and look for the sentence that presents the main point or claim. Typically, the thesis statement is located towards the end of the introduction paragraph, but it can also be found in different parts of the introduction depending on the writing style.

Please provide the specific text of the introduction so that I can help you identify the thesis statement.