The correct answer is - d. none of the above.
All of the suggested things are causing habitat change, each of them in their own specific way:
- Building a dam on a river will stop the natural flow of the river it is build on, thus stop the natural migration of living organisms, the nutrient dispersal, temperature of the water, depth of the water...
- A hurricane usually causes big damages, so it often destroys one habitat, and practically opens up the space for another one to develop afterwards.
- Introducing new hiking trails, even though minor, manage to cause change in the habitat because certain parts of the habitat have to be cleared so practically destroyed, and also maintained, the frequency of people significantly increases, so it is causing a disturbance in the environment.
