Which of the following statements
accurately represents the relationship
between the article's central ideas?
A
Carbon is essential to all life on
Earth, but too much of it can lead
to an imbalance that can be
harmful; human activity has led to
an increase in the levels of carbon
in the atmosphere and ocean.

B. Carbon is an essential element to all life on Earth, comprising and fueling everything on it; carbon is released, absorbed and balanced through two processes: the slow and fast carbon cycles.

C. Carbon is released, absorbed and balanced through two processes: the slow and fast carbon cycles; human behavior, including carbon emissions, have disrupted these two cycles, leading to increased carbon levels in the atmosphere.

D. The slow carbon cycle is the process in which rock is broken down by acid rain, turned into calcium bicarbonate in the ocean, and eventually becomes fossilized on the seafloor; the fast carbon cycle is the process by which carbon moves through living matter.

C. Carbon is released, absorbed and balanced through two processes: the slow and fast carbon cycles; human behavior, including carbon emissions, have disrupted these two cycles, leading to increased carbon levels in the atmosphere.

Explanation:

This statement captures the central idea that carbon cycles are essential for maintaining balance in the Earth's ecosystems, but human activities have disrupted these cycles, resulting in increased carbon levels in the atmosphere, which can have harmful effects.