I think it's C, longer wave length.
It is Tension as the other 3 answer choices would not make sense. Compression would mean you are pressing the rock on both sides or in this case, pushing it into the dirt. It can't be nuclear force as you are pulling out a rock. Air resistance would not make sense either as there is no air involved in the scenario at all.
Answer:
you need to be able to have long enough to reach and have it far away from things that are going to cause accidents
I think the correct answer is D: Potential Energy.
