Select from options: Continue writing the next sentence.

How to clean a concrete patio
Remove all furniture and other objects.
Before getting started, you'll want to make sure your patio is completely clear. Find a place away from your work area to stash patio furniture, dining sets, planters, grills, toys and anything else that may be damaged by free-flowing water or cleaning solutions.

Available options:
a). Off-site cleaners and chemical-free landscaping are usually the most readily available options and they're the ones best suited for this type of project. Equipment like leaking pipes or toxic fertilizers can also be hard to find.;
b). Try to keep away from areas with running water and/or electrical outlets, as well as heating and cooling systems. You need somewhere with air conditioning, power tools (like heaters or refrigerators), and a thermometer to ensure proper cooling.;
c). Your work area should ideally be as empty as you can get it. Bring lightweight furniture inside, and move heavier pieces to the yard, sidewalk or a covered porch.;
d). Avoid impacting animals or fish by having these items removed while working. Wipe down any edges and crevices.;
Answer:
c).