Read the attached passage and then answer this question about it. You are asked to help a student with his conclusion for the attached essay. Which would be the best conclusion option he should use?

A student is writing an informational essay about the impact of global warming on polar bears in the Arctic.

As climate change and the effects of global warming are felt worldwide, scientists have determined that polar bears in the Arctic are just one of the many species facing extinction from our rapidly warming planet. As the ocean waters warm, the main food source for the bears is disappearing. Shortages of food are literally causing these creatures to die of starvation.

Whereas bears could previously walk out onto the sea ice and wait for a seal to poke its snout through, shrinking sea ice means the bears must now walk or swim much farther than they did before to find food. These longer migrations to find food are taking their toll on the bear population.

Seals are a polar bear’s main source of protein. They are also another victim of global warming. With the sea ice melting earlier in the warmer springtime and forming later in the warmer winters, seals struggle with finding a safe place to raise their pups. As a result, their numbers are starting to drop, meaning they are also no longer a plentiful food source for the bears

Read the attached passage and then answer this question about it. You are asked to help a student with his conclusion for the attached essay. Which would be the best conclusion option he should use?
A . The effects of global warming and climate change are seen in a chain-reaction in nature. The melting of the ice creates a struggle for the seals as they seek a safe place to raise their young, and with fewer seals that are more difficult to find the polar bears are starving. The ecosystem is all interrelated and global warming shows us just how delicate a balance it is.
B . Polar bears find themselves in a battle with humans over their main food source. With locals killing seals for food and fur, the polar bears are finding it more and more difficult to hunt. We must enact stricter hunting regulations to save the seals, which will, in turn help to save the polar bears.
C . Before the majestic animals of the Arctic become extinct, people must work hard to drop their greenhouse gas emissions, including driving less and recycling more. Only by reversing the damaging effects of greenhouse gasses can the animals of the Artic be saved. We much step up and do our part to help save the planet.
D . Scientists are still working to understand the effects of global warming and climate change. In Australia, as climate change sparks huge and destructive wildfires, the eucalyptus trees native to the area are being destroyed. This, in turn, has a huge impact on another bear, the koala bear.

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Answer: A