The correct answer are the following ones: 1. by offering supplemental information 3. by providing organization 5. by reinforcing ideas
This is how text features contribute to a text's structure. They give enough information about the text itself. They organize the text in such a way that it is more understandable. They also support your main arguments in the text itself.
Several neighbors heard a loud shrieking noise coming from the home he was at. 3 police officers were sent to go search the house and learn more about the loud noise.