What is the purpose of the photographs that accompany each step of the "Construction in 6 Easy Steps" section of "How to Manage Stormwater: Rain Barrels"?

A. The photographs provide visual representations of the instructions in each step.

B. The photographs show mistakes in the construction process so readers know what to avoid when following the instructions.

C. The photographs provide visual representations of alternative approaches to each step.

D. The photographs show different types of rain barrels so readers can modify the instructions to suit their specific needs.