In some aspects, all farmers in the study area inherit a similar situation: the area experiences uniform rainfall (averaging 2,800 millimeters) and temperature (an average 24C) throughout the calendar year, with little geographical differentiation. A sample of farm’s soil quality and topography shows that good soils and flat lands are common in the area (50% of farms had fertile of moderately fertile soil, over 40% were on level land) (p.10).

According to the paragraph above:

Item 1 - 40% of the area is on flat land.