The correct answer is A) soil erosion.
The option that is not an example of early people adapting their agricultural methods to their physical landscape is soil erosion.
Soil erosion is not an agriculture technique or a method to grow crops. Soil erosion is a form of soil degradation in which the soil loses its fertile properties due to many factors. It resulted from wearing away the topsoil of a field due to natural forces such as the wind, water or human activities such as agriculture.