What happens next in this paragraph?

How to install a drip irrigation system
Check legal requirements.
Before you begin, contact your water purveyor or municipal water department to ask about laws, codes, and permits related to drip irrigation systems. Each area and water purveyor may have its own requirements, and some require a licensed irrigator and/or backflow tester to be present during the installation.
Choose from:
A). These precautions ensure a safe installation that will prevent contamination from your irrigation system into drinking water. If you plan on using the drip irrigation as a temporary system while your landscaping gets established, mention the expected time frame.;
B). Consult with your contractor to confirm what your local requirements are before you proceed. Understand the importance of a drip irrigation system, if applicable.;
C). Water purveers do not have to be licensed from the state they're located in. Check if a stream system passes through the drip irrigation system.;
D). Watch out for anything requiring lengthy or intense inspections or processes. Try to obtain a list of requirements from a licensed irrigator or water manager, as well as any additional documentation.;
A).