Which of the following examples calls for explanatory communication strategies in an informative presentation?

Which of the following examples calls for explanatory communication strategies in an informative presentation?

1. how to shift gears on a bicycle
2. how to replace a flat tire on a bicycle
3. how to ride a bicycle safely on a busy highway
4. how bicycles are used as a major means of transportation in other countries
5. how bicycle gears are constructed and calibrated