Answer:
it is a participal phrase
Silent Spring by Rachel Carson was an environmental science book. It presented the disadvantages of using pesticides to the environment, to the people who used and most especially to the birds around. The book became a tool to express awareness among the people the real harm of industries that made these things.
D. That they argue about silly things
Because of the fact that it is telling a story of a dog and they wanted to to be in first person like it says in the box. So i would say A.
Hope this helps.