In order to determine which practice Roosevelt advocates in the excerpt, we would need to analyze the specific content and context of the excerpt itself. However, based on historical context, Theodore Roosevelt is known for advocating for the regulation of monopolies and trusts during his presidency, particularly through his "Square Deal" policies.
If the excerpt reflects his views on economic reform and addressing the power of large corporations, the answer would likely be:
3. regulation of monopolies
If you can provide specific text from the excerpt, I could give a more precise answer.