How would the message of this text change if it was written in a problem/solution structure?

A) The text would provide a timeline of the issues leading to the changing ecosystem.
B) The text would list the causes of the changing ecosystem and effects of the change.
C) The text would compare and contrast parts of the ecosystem to show how it is changing.
D) The text would provide the reader with a solution(s) to the issue of breaking the food chain.