The most effective way for businesses to be mindful of the planet, particularly the land, in their operations is:
A. dispose of waste in responsible ways.
This option focuses on minimizing the negative impact of business activities on the environment by ensuring waste is handled properly, reducing pollution, and promoting sustainability. The other options, such as cutting down trees, operating in large spaces indiscriminately, or allowing chemical runoff, could result in significant harm to the land and ecosystem.