What best describes the concept of environmental degradation? 

A)  letting agricultural runoff cause oxygen depletion and fish kills downstream 
B)  using oil to make gasoline 
C)  using solar power at a rapid rate 
D)  cutting trees for wood products

Environmental degradation refers to the deterioration of the environment through the depletion of natural resources, such as air, water, and soil. Option A best describes this concept as it refers to the negative impact of agricultural activities on the ecosystem, leading to reduced oxygen levels in water bodies and resulting in the death of aquatic animals. This is an example of how human activities can degrade the environment, causing harm to both flora and fauna. Option B refers to the use of fossil fuels, which contributes to climate change, while option C refers to the use of renewable energy, which is actually beneficial for the environment. Option D refers to deforestation, which is another activity that can cause environmental degradation.