You can safrly hike without trainings, or lessons.
Unlike the other options, people aren't just walking. Their doing a lot more than just walking. Which makes them pretty dangerous for people who have never trained, or haven't had any lessons. Which when hiking your just walking.
C. Hike because all you're doing is walking and you can not get trained on walking. But Rock climbing the instructor tells you how to climb save. And the same for Scuba dive because a instructor is there to guide you.
