Which claim made by the author has insufficient evidence to support its accuracy? O A.
Urban gardeners use these roofs to construct large planters for vegetables, grass, trees, and shrubs.
OB. They also help the environment by refreshing the air and by reducing smog and effects to the ozone layer.
O C.
With a little thought, any city dweller can think of an area of land on which to grow a garden.
D.
This means that irrigation for crops is not a problem.