Which of the following best explains the impact urbanization has on the carbon cycle? a)An increase in the population results in the depletion of groundwater, causing sinkholes to occur.

b)Decaying organic matter increases in landfills, which increases the amount of carbon dioxide in the atmosphere.

c) Human-made structures absorb solar radiation and cause an acceleration of the greenhouse effect.

d) Increased runoff causes soil to erode and prevents the growth of vegetation.