Answer:
C. Agricultural Intensification (Farming)
Explanation:
The question asks you which of the following is an example of people adapting and modifying their landscape.
This means that it has to be a behavior that is actively changing the terrain.
You can think of the landscape before and after the activity is done: if the landscape remains the same, there is no modification.
Calling a friend does not modify somebody's landscape- it is an action with no effect on geography.
Singing in a forest also does not modify a landscape. The landscape will remain the same both before and after you sing.
On the other hand, farming/agricultural intensification is a good example of people adapting and modifying their landscape.
Before the activity occurs, you may have a relatively barren area. However, afterward, you'll have crops and soil that are much more nutrient dense.
People are adapting by making the landscape more suitable to their needs through this modification.
Only in this activity is the geography actively changing.