How does the structure of the passage above impact the meaning of the text?

Responses
A The author presents a list of problems about the ecosystem followed by solutions to fix them.The author presents a list of problems about the ecosystem followed by solutions to fix them.
B The author provides details about the ecosystem in the order that they occurred.The author provides details about the ecosystem in the order that they occurred.
C The author compares and contrasts parts of the ecosystem to show how it is changing.The author compares and contrasts parts of the ecosystem to show how it is changing.
D The author lists causes of changes in the ecosystem and their effects on the environment.

A The author presents a list of problems about the ecosystem followed by solutions to fix them.