The six icons shown here are part of a model for understanding global change. Icons represent population growth, agricultural activities, deforestation and reforestation, habitat loss and restoration, invasive species, and urbanization.

What does the set of icons represent in the model?

A. human inputs to the global energy budget
B. human causes of changes to global systems
C. human activities that are independent of global change
D. the effects on human society of changes to global systems