Final answer:
Section 25 of the Criminal Code protects a private person making a lawful arrest, giving them legal authority to act when they have reasonable grounds to believe a criminal act is being committed.
Step-by-step explanation:
The section of the Criminal Code that protects a private person making a lawful arrest is Section 25. This section outlines the legal protection for citizens who undertake the act of arresting someone they believe has committed or is in the process of committing a criminal act. The legality of such an arrest is contingent upon the person performing the arrest acting within the boundaries set by law.