Life is a web, with every strand connected to every other strand. For example, herds of caribou live in cold, Arctic locations. Caribou hate mosquitoes. In the past few years, warmer temperatures in summer have allowed mosquito populations to explode. So the caribou spend a lot more energy swatting away the mosquitoes. All this swatting leaves the caribou less energy to find food and prepare for the next long winter. Female caribou are especially troubled because it takes so much energy to give birth and raise their young.

http://www. nasa. gov/climatekids

Which would function MOST EFFECTIVELY as a concluding sentence?
A) This shows that even if one species of plant or animal changes, events involving other species are not affected.
B) As you can see, when you closely study a variety of animals and plant species, you will always be amazed and confused.
C) This illustrates that when one species of plant or animal changes, a whole chain of events can follow involving other species.
D) This is another example of the amazing existence of our wonderful world of plants and animals.