Answer: D, and underline the first sentence- "if the snake population changes, other changes occur up and down the food chain."
Explanation:
A good rule of thumb is usually that the main idea/topic sentence/thesis statement of a paragraph or article will usually be at or around the beginning.
And with the summary- it just states the closet idea to the thesis statement. I know it's not A, because the paragraph doesn't talk about domesticated snakes at all. I know it's not B or C, because largely it's about snakes, not hawks. The paragraph talks about the population hypothetically increasing or decreasing and about 3 other species that would be affected, so D is the best summary of the information.
Hope you do well on your assignment :)
