Many Homeowners Mow Their Lawns During the Summer and Collect

Many homeowners mow their lawns during the summer and collect the clippings, which are then hauled to the local landfill. Which of the following actions would most benefit the local ecosystem?

A) Allow sheep to graze the lawn and then collect the sheep's feces to be delivered to the landfill.
B) Collect the lawn clippings and burn them.
C) Either collect the clippings and add them to a compost pile, or don't collect the clippings and let them decompose into the lawn.
D) Collect the clippings and wash them into the nearest storm sewer that feeds into the local lake.
E) Dig up the lawn and cover the yard with asphalt.